| Artist name | Roles | Recordings |
|---|---|---|
| Focus (Dutch progressive rock group) | ||
| John Mayall |
| Artist name | Roles | Recordings |
|---|---|---|
| Focus (Dutch progressive rock group) | ||
| John Mayall |
| Artist name | Roles | Recordings |
|---|---|---|
| Focus | drums | Birth, Early Birth, Hamburger Concerto, Harem Scarem, La Cathédrale de Strasbourg |
| John Mayall | drums | Fly Tomorrow, The Bear, Walking on Sunset |