0
Alan Morse
Alan Morse
American musician
1
Spock's Beard
Spock's Beard
American progressive rock band
2
Neal Morse
Neal Morse
American multi-instrumentalist and progressive rock composer
3
Mike Portnoy
Mike Portnoy
American drummer
4
Nick D'Virgilio
Nick D'Virgilio
American musician
5
Transatlantic
Transatlantic
Progressive rock supergroup
6
Dave Bainbridge
Dave Bainbridge
Keyboardist and guitarist
7
Dave Meros
Dave Meros
American musician
8
Steve Morse
Steve Morse
American guitarist and composer
9
Beardfish
Beardfish
band
10
Flying Colors
Flying Colors
US supergroup
11
Patrick Moraz
Patrick Moraz
Swiss musician
12
Dixie Dregs
Dixie Dregs
American band
13
Jimmy Keegan
Jimmy Keegan
American musician
14
Iron Butterfly
Iron Butterfly
American rock group
15
Kansas
Kansas
American rock band
16
Casey McPherson
Casey McPherson
American singer-songwriter
17
Chuck Leavell
Chuck Leavell
US musician
18
Eric Burdon
Eric Burdon
English singer-songwriter
19
Andy Timmons
Andy Timmons
American guitarist
20
The Animals
The Animals
English band
21
Dizzy Reed
Dizzy Reed
American musician
22
Trevor Rabin
Trevor Rabin
South African-born musician, singer-songwriter, producer, and film score composer
23
The Flower Kings
The Flower Kings
Swedish progressive rock group
24
Guthrie Govan
Guthrie Govan
British musician
25
Paul Burgess
Paul Burgess
British musician
26
John McLaughlin
John McLaughlin
English guitarist, bandleader, and composer; founder of the Mahavishnu Orchestra
27
Alan Pasqua
Alan Pasqua
American pianist
28
T-Square
T-Square
Japanese jazz fusion band
29
The Derek Trucks Band
The Derek Trucks Band
American rock and blues band
30
Peter-John Vettese
Peter-John Vettese
British keyboardist, songwriter, arranger and record producer
31
Haken
Haken
British band
32
Tony Kaye
Tony Kaye
English rock musician
33
Chris Pitman
Chris Pitman
American musician
34
Bernie Worrell
Bernie Worrell
American musician
35
Frehley's Comet
Frehley's Comet
American heavy metal 1980s rock band formed and led by ex-Kiss lead guitarist Ace Frehley
36
Dynasty
Dynasty
band
37
Yes
Yes
English rock band
Intro
American musician
Member of, past and present

Ryo Okumoto (奥本亮, born May 24, 1959) is a Japanese rock keyboardist, best known for his work with progressive rock group Spock's Beard. He joined the band in 1996 and has been a member ever since. When singer and keyboardist Neal Morse was in the band, Ryo played Hammond organ and Mellotron on the albums. Since Morse's departure, Okumoto has played all of the band's keyboard parts. He resides in Los Angeles.

Aside from his work with Spock's Beard, Okumuto has performed and recorded with numerous other artists and groups, including GPS, K², Phill Collins, Eric Clapton, and Asia featuring John Payne. For three weeks in 1998, Okumoto was a member of Eric Burdon & the New Animals, before being replaced by Martin Gerschwitz.

Okumoto was a member of Eric Andre's house band on season 5 of the Eric Andre Show.