The Graveyard: As you wander around you should notice a graveyard. You'll get a badge just for finding it, and you can get more by playing songs on the tombstones.
Remember, you need to stand next to the tombstone that you are touching or it won't work.
Known Songs:
Scale: 12345678
Twinkle, Twinkle Little Star: 55 22 33 2 11 77 66 5 22 11 77 6 22 11 77 6 55 22 33 2 11 77 66 5
Mary Had A Little Lamb: 7656 777 666 722 7656 777 766 765
Funeral March: 1111 322 1111
The Saints Go Marching In: 5712 5712 5712 7576 7655 7221 7127 565
Beethoven's 5th Symphony: 5553 4442 5553 7776 8887
The Hearse Song (Worms crawl in): 2323 2323 2355 4323 5
Camptown Races: 1161 216 6565 1161 216 5654