Approximately Infinite Universe is a double album by Yoko Ono, released in early 1973. It represents a departure from the experimental avant garde rock of her first two albums towards a more conventional pop/rock sound, while also dabbling in feminist rock. It peaked at #193 in the United States. The 1997 CD re-issue on Rykodisc added two acoustic demos of songs from this era, that were later released on 1981's Season of Glass. It was released again, in 2007 by Rykodisc.
Mick Jagger dropped into the studio for some sessions. He said he was playing the guitar very loudly with John Lennon. Mick went on to say that Yoko "was really trying to sing properly. She's not screaming, she's really trying to sing."