Aorta was a short lived Chicago band that recorded their debut LP for Columbia in 1969. The LP peaked at 168 on the Billboard charts but is considered something of a psych/prog classic now. This track starts with some weird sound effects then kicks in with some really heavy drums (someone needs to chop these up!) before settling into a nice pop-psych groove. Great guitar, organ, drums and vocals, who needs anything more!?!?
It should be noted that the version on here is the album version not the (slightly different) single version.