I try to delete music and it wont let me and if i do i can put in music afterwords y

Try to delete your music this way:

Deleting Files,Pictures,Videos,Audio Books, etc. from MP3 Player
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Hook up your mp3 player to your computer
Go to your desktop and double left click on "My Computer"
When it opens you will see listing that says "Devices with Removal
Storage" your mp3 player should be listed there.
Right click on your mp3 player, and a window will open, right click on
"Open" and now your files/songs should be visible.
Hold the left click down and drag it across all the files/songs that
you do not want this will highlight the files/songs you do not want,
release, right click and then click on "Delete"
Now your mp3 player should be clear of the files/songs you do not want.
Be careful and do not delete files needed to operate your MP3 player.
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