There are at least 9 bands/artists with the name Troy:

Troy:
Troy is a character portrayed by Zac Efron in the High School Musical series of movie-musicals. In the first film, his voice is provided by Drew Seely. In both sequels, Zac Efron’s own voice is used for Troy.

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