Try the following web sites to download music. It does cost money. This is a good alternative to buying entire books of music if you don’t need or want that.

When you do purchase music, and if you are using this for singing, avoid the ‘Easy Piano’ versions of songs. They tend to be in the wrong keys for singers.

www.wikifonia.org
This one is free!

www.musicnotes.com

www.freehandmusic.com

www.sheetmusic.com

www.sheetmusicplus.com