The Indigo-Go's is a very popular Zora band found in Majora's Mask. So popular, in fact, that you need to buy a ticket just to see them practice. The band includes Evan the Pianist and leader of the band, Lulu the Lead Singer, Mikau the Guitarist, Japas the Bassist, and Tijo the Drummer.
The Indigo-Go's are supposed to play at the Carnival of Time, but are initially prevented by various problems. The first is Lulu's loss of her eggs to the Gerudo pirates and subsequent loss of her voice. The second is that Mikau has been missing since he went to get back Lulu's eggs back from the pirates.