"His World" is the main theme song from Sonic the Hedgehog (2006) and it is also Sonic the Hedgehog's theme in the game. It also serves as the main theme. The song was performed by Ali Tabatabaee and Matty Lewis from the punk rock band Zebrahead, and was composed by Tomoya Ohtani. It features an assortment of rock, rap, and orchestral parts. It also appears in Sonic Generations as an unlockable song.