Haih is the first record to be released by Os Mutantes in 35 years. Cited by such all-stars as Beck, the Flaming Lips, and Nirvana as being one of the most influential figures to come out of the tropicalia movement, bandleader Sergio Dias Baptista has nonetheless kept the Os Mutantes name quiet until now. Haih features lyrics written by fellow Brazilian musical legend Tom Ze, as well as a collaboration with Jorge Ben. Baptista said regarding the album, “Living the conception and birth of this album, as an individual, was the most intense experience, for it was as if time has ceased to exist, and I was bouncing from life to life, decades through decades, revisiting myself as a 16-year-old boy playing guitar and feeling so free and, as any teenager, indestructible.”