Autolux is an American alternative rock band consisting of Eugene Goreshter (vocals, bass), Greg Edwards (vocals, guitar, piano) and Carla Azar (drums, vocals).
 The trio formed in 2001 and have released three full-length albums, "Future Perfect" (2004), "Transit Transit" (2010) and "Pussy's Dead" (2016).
 Their eclectic sound draws from post-punk, electronic music and krautrock.
Polvo is an American indie noise rock band from Chapel Hill, North Carolina.
 The band, formed in 1990, is fronted by guitarists/vocalists Ash Bowie and Dave Brylawski.
 Brian Quast plays drums, and Steve Popson plays bass guitar.
 Eddie Watkins was the band's original drummer, but did not rejoin the band upon its reunion in 2008.

Question: Autolux and Polvo are both types of what?
Answer: rock band