Eddie Harris: electric sax (all), electric trumpet (1, 6), singing (through his horn) (1), acoustic piano (6-13), electric piano (7-13), vocals (7-13)
Albert Lee: guitars (1-6)—solos on (1, 4)
Neil Hubbard: guitars (1, 2)
Jeff Beck: guitars (3, 4)—solo on (4)
Zoot Money: electric piano (1, 2)
Stevie Winwood: electric piano (3-6)
Tony Kaye: Moog synthesizer (5, 6)
Raymond ("Boz") Burrell: bass (1-3)
Rick Grech: bass (4)
Chris Squire: bass (5, 6)
Alan White: drums (1, 2, 5, 6)
Ian Paice: drums (3, 4)
Lofy Amao: congas (3, 4)
Ronald Muldrow: guitar (7-13), guitorgan (7-13)
Rufus Reid: electirc bass (7-13), string bass (7-13)
William James: drums (7-13), electric bongos (7-13)
 

Produced by Geoffrey Haslam
Executive producer: Nesuhi Ertegun (1-6)
 

Tracks:
In the U.K.
1. Baby [E. Harris] (6:45)
2. Wait a Little Longer [E. Harris] (4:12)
3. He's Island Man [E. Harris] (2:25)
4. I've Tried Everything [E. Harris] (8:13)
5. I Waited for You [Charles Stepney] (5:48)
6. Conversations of Everything and Nothing [E. Harris] (15:54)

Is It In
7. Funkaroma [E. Harris/Muldrow/Reid/James] (5:00)
8. Is It In [Muldrow] (3:35)
9. It's War [E. Harris/Muldrow/James] (6:20)
10. Space Commercial [E. Harris/Muldrow/James] (5:28)
11. Look Ahere [Sara E. Harris] (3:48)
12. These Lonely Nights [S. E. Harris] (5:46)
13. Tranquility & Antagonistic [S. E. Harris] (4:15)
 

Notes: A combination of two 1974 albums by jazz saxophonist Eddie Harris, although Is It In (Atlantic 1659) is not quite complete (omitting "Happy Gemini" and "House Party Blues"). However, it is the first album that concerns us here: subtitled "The Eddie Harris London Sessions", E.H. in the U.K. (Atlantic 1647) includes numerous well-known 1970s British rock musicians, including three Yesmen. (HP, 12 Sep 06)