Caprici di Diablo is a song by Yngwie Malmsteen's Rising Force, and is considered one of the hardest songs in Rock Band for the guitar, along with songs like "Thrasher", "Constant Motion", "Warriors of Time" and "Surfing With The Alien". The songs verse and riffs is mainly hard HO/PO lines, and some of the solos are made by very fast decending triplets. The drum part is not very hard, but be ready to use your foot, and the bass part is pretty challenging, but not one of the hardest. There is no vocals in this song, so you can't play it if a vocalist is in the band at the moment.