Please note that The Time Machine, On Air and Try Anything Once are not by The Alan Parsons Project, and should be filed under the Alan Parsons artist (the new name of the project after Eric Woolfson's departure).
The Alan Parsons Project was the collective reference to several lineups of a British progressive rock team, active between 1975 and 1990, whose rosters consisted of Alan Parsons and Eric Woolfson surrounded by a varying number of session musicians and some relatively consistent band members such as guitarist Ian Bairnson, arranger Andrew Powell, bassist and vocalist David Paton, drummer Stuart Elliott, and vocalist Lenny Zakatek.
Behind the revolving line-up and the regular sidemen, the true core of the Project was the duo of Parsons and Woolfson. Parsons was an audio engineer and producer by profession, but also a musician and a composer. A songwriter by profession, Woolfson was also a composer, a pianist, and a singer. Almost all songs on the Project's albums are credited to "Woolfson/Parsons."