The primary single-player game mode is Career mode, which can be played on the lead guitar, bass guitar, drums, or vocals. Career mode has been slightly altered from previous "Guitar Hero" games. After creating a band, selecting or creating an avatar, and then selecting an instrument, the player is then presented with one of several gigs containing two to five songs each. Most gigs end with an encore song that is not revealed until the other songs are completed. Two of the lead guitar gigs feature "boss challenges" with Zakk Wylde and Ted Nugent; these boss challenges, featuring original songs by Wylde and Nugent, are different from ""s boss battle, removing the focus on attack power-ups and instead featuring a call-and-response mechanic similar to the existing Face-Off mode. The gigs are arranged by difficulty based on the selected instrument. The player is awarded in-game money for each song completed, and completing each gig can also award additional money for meeting certain criteria, such as never letting the Rock Meter drop below a certain level or playing the first several notes of a song perfectly. Completing a gig can also unlock one or more gigs with more difficult songs to complete. Additional awards, such as customization items, are also awarded for completing gigs. The player's accumulated earnings across any of the single player Career Modes are tracked and used to rank the player's overall performance level.