Haih or Amortecedor is the ninth studio album by the Brazilian rock band Os Mutantes, their first studio album since Tudo Foi Feito Pelo Sol in 1974 and the first one of new material since Mutantes Ao Vivo in 1976.

Following the band's 2006 reunion at London's Barbican Theatre, Mutantes founder Sergio Dias commenced work on Mutantes' first studio album in 35 years.

Dias collaborated with Tom Zé and Jorge Ben (who wrote the band's original hit "A Minha Menina").

[1] 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.The word "haih" means "crow" in the Shoshone language.

"Zheng He" and "Singing The Blues" appear only on the Brazilian version, along with two songs that are bonus tracks on the standard edition: "Amortecedor" and "Call Me".