The Alan Parsons Project

The Alan Parsons Project were a British rock duo formed in London in 1975. Its official membership consisted of producer, audio engineer, musician and composer Alan Parsons, and singer, songwriter and pianist Eric Woolfson. They shared writing credits on almost all of their songs, with Parsons producing or co-producing all of the recordings, while being accompanied by various session musicians, some relatively consistently to the point that they are considered as members by many fans.

Biography summary from English Wikipedia, photograph via Wikimedia Commons.