My mp3 Doesn't play some files

MP3 players can only play music files in mp3 file format. You need to convert your CDs to mp3 music files onto yourcomputer or download them from the Internet and then copy them to your MP3player.
You can do this using Windows Media player and Rip the CDs - Media Player willcreate a MP3 music file for each music track.
Click on this link for instruction on converting music files to mp3 file format:- http://www.fixya.com/support/r5798418-creating_transferring_mp3_music_files

1. Use Windows Media Player to put songs on your Coby MP3 player. Download songs in MP3, WMA, or OGG format from a legal downloading website. If the file is not one of the previously mentioned files, you must download a converter to convert the file to one of the correct files that can be played on Windows Media Player. Rip a song from a CD by inserting the CD and then click on the option to "Rip" the song to your library. Some Coby MP3 players do not need Windows Media Player to add songs, so be sure to check your user manual to see if there is an even simpler method.
2. Connect your Coby MP3 player to your computer using the USB connector that came with your MP3 player. The player will show up under the "Devices" option on your Window Media Player application.
3. Click on the "Library" option to view all of the songs stored on your Windows Media Player library. You can drag the song to the MP3 player in the "Devices" section, or you can right-click on the song and choose the option to transfer the song. In the pop-up box choose your MP3 from the drop-down menu and then click on the "Transfer" button.
4. Right-click on the MP3 player in Windows Media Player and choose the "Eject" option. Disconnect your MP3 player from your computer and turn it on. The song will now be available on your MP3 player. Press the bottom button to play or pause the song.
5. Add videos and pictures to your Coby MP3 player if it supports those files. The process is similar to transferring audio files. Plug your MP3 player into your computer. Open the photo file on your computer and drag pictures into the player. You can create folders to organize the pictures.

find out what type of media you can play .if you can play wma then you just use your windows media player to sync to the device and then load your songs and video to the player using windows media player !! Then hit the sync button to load player!! If doesn't use wma then find out which type files it plays then find out which music service it syncs to!!swampratt200!!AAAEEE!!!

check the file types from you music the shaker only plays MP3 and PCM WAV  file types. You may have WMA (if u used windows media player) which will not play on the shaker  (i had this same ploblem btw) you can easly find free music file converter software to change these files to mp3 or wav types (which i did), or you could rerip to songs from a cd and tell the windows media player to rip the files as mp3 types instead of the default wma format  from the windows media player widow :
tools >> options >> Rip Music >> under format select mp3 (theres a wav option but i used the mp3 option to be safe) 
do not use the sync feature it will automatically convert your files to to wma (why? i dont know) instead copy the files directly from the folder that contains them :
right click the file you need to put on the player select open file location drag and drop to the player (or copy/paste if you want).
hope this helped =P 

I managed to get this sorted by changing the default setting in windows media player from ripping the CDs as a wma protected file to a mp3 file.

The songs are in the wrong format - they need to be stripped of their DRM license (illegal) or converted to mp3 format.  The best, most legal way to do this is to redownload the songs as an Mp3 file, or re-rip your CD's in Windows Media Player in Mp3 format.
these problems occur because the user is trying to download a song format that the player does not recognize. Every music file is in a certain format. The most common music file formats are Mp3, WMA, AAC (iTunes), WAV, RA, etc.  In addition, every file format type is in a certain bitrate, size, etc.  By far the most common issue is that the music file contains a license or copyright (especially with WMA or AAC file formats).  Each Mp3 player only recognizes a certain number of these formats. Every Mp3 Player is different. You will have to check your Mp3 player’s product specifications (specs) or user’s manual to find out which formats your particular Mp3 player recognizes. When you try to download or sync the wrong file format, you will get one of the errors that I mentioned above.   If you want to know what file type you have, then you must find the location of the individual music file on your computer, right click the title of the song, and select the option “Properties” from the menu.
Mp3 player product documentation is not straightforward.  If a player supports only non-protected WMA files, it will merely say that it supports WMA – it will not tell which type of WMA it supports.  A player that supports DRM-protected WMA’s will usually indicate such on the box (usually with a Windows Plays For Sure logo – which is actually an ironic misnomer).  DRM stands for Digital Rights Management, and it is a type of licensing system for WMA files.  It is used extensively by mp3 player music services such as Bearshare, LeapFrog, Napster, and others.  Not all DRM licenses are created equal – there are licenses with “play rights,” burn rights,” and “transfer rights.”  Play rights mean that you can only play the song on your PC – it will play fine on your computer, but it will not play in your mp3 player even though it appears to transfer.  Burn rights mean that the song can be burned to CD.  Transfer rights mean that the song can be transferred onto an mp3 player that supports DRM-protected files.  Then, there are unlimited licenses and limited licenses.  Limited licenses only allow you to play a song for a certain length of time. You would have to pay extra to continue using the song after that trial period is over – the time length ranges from a few days to several months or longer.

-Tha Mp3 Doctor

Are you getting a specific error message when you try to transfer songs? Does it look like they are transferrring, and then do not play? Are you just looking for the program that you would use to transfer songs? I would suggest Windows Media Player. Is iTunes your music service? If so, they will not work with this mp3 player.

You can also drag and drop the Mp3 or WMA files from Windows Explorer:
Try this - connect your mp3 player to computer --> double-click on My Computer --> double-click on the icon of the mps player --> double-click on the music folder --> drag and drop the music files to a folder/desktop of your own choosing

Check the format of the song - this player will play mp3 or wma, but if your wma's do not have "transfer rights" then you cannot transfer them to this or any other player.

-Tha Mp3 Doctor

hi,

Have you tried connecting to the net and then continue to subscribe??

It sounds like these wma files have DRM protection.

You can still play these songs on your mp3 player, but you must use Windows Media Player to transfer them.

To do this, connect your mp3 player to your computer, then open Windows Media Player. In WMP select "Sync" & you should see your mp3 player in the right-hand pane. Drag & drop your wma files across. It's a slow way to do it, but the only way to transfer wma files with DRM.

Let me know how you get on!