There are several places all of varying quality. Places like the IMSLP / Petrucci Music Library have a large collection of public domain music; while online-musiclibrary.com has a considerable amount of what looks to be user-submitted downlods.
Naxos Music Library is an online resource tool allowing users to access their comprehensive collection of music of various types such as Classical, Jazz, Folk, Chinese among others. Playlists can be generated by users as well as biographical information on composers. The site offers over a million tracks of entertaining music while serving as a valuable educational resource.
You can find humoresque sheet music for violin at music stores, online sheet music websites, or by searching for it in a library's music collection.
You can find the Satie Gnossienne sheet music at music stores, online sheet music websites, or by searching for it in a library's music collection.
You can find and access the "How Do You Keep the Music Playing" sheet music by searching for it online on websites that offer sheet music downloads or by visiting a music store that sells sheet music.
You can find the sheet music for the hymn "Amazing Grace" at music stores, online sheet music websites, or by searching for it in a music library.
Yes, amazon has a large library similar to iTunes for the kindle.
imslp.org, The Petrucci Music library, or any online music publisher (music room etc)
many ways. you can rip music from a CD, transfer the files using a USB stick or buy un-owned music from the iTunes online store
If you are looking to listen to online music, I would direct you to head over to Pandora.com. Alternatively, if you have an account, iTunes.com has a large selection of music.
There are sites online that give you access to free music such as imslp.
No, Spotify does not play CDs. It is a streaming service that allows users to access and listen to a vast library of music online. Users can stream music directly through the Spotify app or website, but CDs need to be played on a CD player or compatible device.
You can find the sheet music for Prokofiev's "Dance of the Knights" in music stores, online sheet music websites, or by searching for it in a library's music collection.