The following musicians rehearsed with Frank Zappa, but left the band before the tour started.
| Musician | Instruments | Approximate dates | Approximate band line-up |
|---|---|---|---|
| Buddy Helm | drums | January or February, 1973 | 4a |
| Burleigh Drummond | drums | January or February, 1973 | 4a |
| Robert "Frog" Camarena | guitar, vocals | June-August, 1975 | 5b |
| Novi Novog | viola | June-August, 1975 | 5b |
| Denny Walley | slide guitar | June-August, 1975 | 5b |
| Vinnie Colaiuta | drums | January-February, 1980 | 6b |
| Sinclair Lott | drums | February or March, 1980 | 6b |
| Marty Zevin | drums | June, 1981 | 7a |
| Lisa Popeil | keyboards, saxophone, vocals | August, 1981 | 7a |
| Brad Cole | keyboards | June, 1984 | 7b |
| Tom Freeman | drums | November-December, 1987 (one rehearsal, when Chad had to leave for a TV gig) |
7c |
| Howard Kaylan | vocals | November-December, 1987 | 7c |
| Tommy Mars | keyboards | November-December, 1987 | 7c |
| Mark Volman | vocals | November-December, 1987 | 7c |
| Ray White | guitar, vocals | November-December, 1987 | 7c |
And the following band rehearsed, but the project was canceled when some of the musicians approached FZ for more money.
| Musician | Instruments | Approximate dates |
|---|---|---|
| Jeff Berlin | bass | early 1981 |
| Vinnie Colaiuta | drums | early 1981 |
| Richard Emmet | guitar | early 1981 |
| Ed Mann | percussion | early 1981 |
| Tommy Mars | keyboards | early 1981 |
| David Ocker | clarinet | early 1981 |
| Steve Vai | guitar | early 1981 |
Band line-ups:
1-Black 2-Dunbar 3-Gordon 4-Humphrey/Thompson 5-Bozzio 6-Colaiuta/Logeman 7-Wackerman
The Planet Of My Dreams