The Ice Cap Zone theme song was introduced in Sonic 3 and is used in the respective zone. Like every other Sonic 3 zone, the Act 1 theme is different than the Act 2 theme. A different Ice Cap theme was used in Sonic & Knuckles Collection. It has been speculated that famous pop star Michael Jackson was involved, as the song has been compared to "Smooth Criminal" and "Who Is It", two songs that he performed. However, it was recently discovered that the song shared the exact same bassline of "Hard Times" by the Jetzons. Brad Buxer, one of the composers for Sonic 3, was keyboardist of the band.