Y'all (yes, I actually say that since I've moved south) have probably known about this site for YEARS, but I just found it about 5 minutes ago. WOW! is all I can say. =)
Songs and Hymns.org
You can listen to the song, download an MP3, and print sheet music (or just the lyrics.) There's background information on the hymn, a biography page for the lyricist and composer. AND there's a devotional to go with it! It has everything you might need to do a hymn study. Can you tell I'm excited? =)
This term for AO we are studying O God, Our Help in Ages Past.