My Sansa Shaker wont take the music.

The Sansa Shaker supports only .mp3 and .wav file formats. It is possible that you have synced WMA or M4A audio files that have DRM protection. These formats are not supported by the SANSA SHAKER.
Songs purchased through Amazon or copied from your music collection in mp3 format will play on your SHAKER.

1. First, you have songs saving in your computer.
2. You have 2 ways to put music on the Sandisk Sansa Clip:
2.1. Plug device into computer, Drag and Drop music from your computer into "Music" folder of the Sandisk Sansa Clip.
2.2. Use Windows Media Player in your computer to transfer songs to your device; Plug device to computer, open Windows Media Player, click on Sync tab, drag and drop music into "Drag items here " on the right side of the windows media player, click on Start Sync button.
Good luck

Instead of dragging, try copy and pasting the music files

i wouldnt use sync feature for the shaker read the following:
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 

The songs need to be formatted for a sansa. Use Windows Media Player 11. Don't use Rhapsody, too many problems.
Load a CD into your computer, on the Toolbar of WMP11 click rip, After all songs are ripped, hook up your Sansa to the computer via USB cable, Click Sync. WMP11 will not only sync the sansa it will sync the micro card also. You have your choice where you want to put the music. Drag and drop the music in the box to the left where you synced your sansa and at the bottom of the box click Sync. All music will be synced to your sansa or card which ever one you chose. Understand, when the sansa starts up, the card syncs with the sansa, you don't have to do anything. Try this and let me know how it works.

you have to hold the play pause button until you hear a noise and music starts playing

sansa shakers can only play wma and mp3 music!

ITunes songs are not in MP3 format.

The Shaker will only play MP3s

Did you copy your own CD's to the computer? The default settings for Windows Media Player "RIP Music" are to rip as WMA format. The music needs to be in mp3 format. Change your settings in Windows Media Player. Tools>Options>RIP Settings. Select mp3, under the drop down menu. Best of Luck.

You should not use a program to manage your music on the Sansa Shaker. Just use My Computer to manually drag & drop files onto the device. Also, you can format the device thru My Computer, right click on the device and select format, this will erase everything on the device. Best of Luck