- Vocals, Keyboard: Donald Fagen
- Guitar, bass, vocals Walter Becker
- Guitar: Denny Dias
- Guitar: Larry Carlton
- Guitar: Lee Ritenour
- Keyboard: Victor Feldman
- Keyboard: Joe Sample
- Tenor Saxophone: Wayne Shorter
- Drums: Steve Gadd
- Drums: Jim Keltner
- Bass: Chuck Rainey
- A & R Recording Studios, New York
- ABC Recording Studios, Hollywood
- Producer's Workshop, Hollywood
- Sound Labs, Hollywood
- Village Recorder, West Los Angeles
- Warner Bros. Recording Studios, North Hollywood
The album has a strong jazz influence, jazz musicians such as Wayne Shorter, Lee Ritenour, Victor Feldman and Joe Sample were used. It is an example for perfectionism, Becker and Fagen developed in the arrangement and production of their music. Within three weeks after it was already in the top 5 of the U.S. album charts, as one of the first records ever it went platinum. For the first single Peg was selected ( # 11 in the U.S. singles charts), later followed by the seven -minute Deacon Blues ( # 19) and Josie (# 26).
In July 1978, the album Grammy Award for the best technical recording won (Off- classical). In 2003 it was added to the Grammy Hall of Fame, voted by the readers of Rolling Stone ranked number 145 in the list of the 500 best albums of all time in the same year.
Stephen Thomas Erlewine praised at Allmusic, where Aja is rated four and a half stars out of five, the album as a " shining example of jazz - rock at its best ":
The album was recorded in the Grammy Hall of Fame in 2003.
In April 2011, the album was recorded by the Library of Congress into the National Register recordings ( National Recording tab ) as " culturally, historically, or aesthetically important".
All songs were written by Walter Becker and Donald Fagen.