There are at least 6 bands/artists with the name Troy: Troy: Incorrect Name Of The Artist.
The most common use of Troy in Last.Fm, It's an incorrect tag to Zac Efron, So, Please, Do Last.Fm a favor and fix your tags.
Troy is character that actor Zac Efron plays in a musical movie. Troy (The Band):
Troy is a Rock band from Springfield, MO that consists of Chris, Kane, Cord, and Johnny B. They've recently opened up for such bands as Breaking Benjamin, Three Days Grace, Skillet...

Read more about Troy on Last.fm.