The 1960s
| Date | Instrument | Name |
| Formed Autumn 1963 | Vocals | Adrian Williams |
| Lead Guitar | John ‘Ducksy’ Reardon | |
| Rhythm Guitar | Robert Price | |
| Bass Guitar | Dave Sargent | |
| Drums | Steve Strong | |
| Harmonica | Will Lowe | |
| Early 1964 | Vocals | Adrian Williams |
| Lead Guitar | John ‘Ducksy’ Reardon | |
| Rhythm Guitar | Andy Gibbon | |
| Bass Guitar | Robert Price | |
| Drums | Steve Strong | |
| Harmonica | Will Lowe | |
| Mid 1964 | Vocals | Adrian Williams |
| Lead Guitar | John ‘Ducksy’ Reardon | |
| Rhythm Guitar | Andy Gibbon | |
| Bass Guitar | Robert Price | |
| Drums | Chippy Chapman | |
| Aug 1965 | Vocals | Adrian Williams |
| Lead Guitar | John ‘Ducksy’ Reardon | |
| Bass Guitar | Robert Price | |
| Drums | Phil Edwards | |
| Feb 1966 | Vocals | Adrian Williams |
| Lead Guitar | John ‘Ducksy’ Reardon | |
| Bass Guitar | Andy Gibbon | |
| Drums | Phil Edwards | |
| Nov/Dec 1966 | Vocals | Adrian Williams |
| Lead Guitar | John ‘Ducksy’ Reardon | |
| Bass Guitar | Andy Gibbon | |
| Drums | Ted Dyer | |
| Keyboards | Dave Kubinec | |
| Sax | Dave Martin? | |
| Sax | Chris Armstrong? | |
| Trumpet | Phil ‘Coco’ James | |
| Feb 1967 for a month or so | Vocals | Adrian Williams |
| Lead Guitar | John ‘Ducksy’ Reardon | |
| Bass Guitar | Dave Martin | |
| Drums | Ted Dyer | |
| Keyboards | Dave Kubinec | |
| Sax | Chris Armstrong? | |
| Trumpet | Phil ‘Coco’ James | |
| Spring 1967 | Vocals | Adrian Williams |
| Lead Guitar | Mickey Evans? | |
| Bass Guitar | Rob Evans? | |
| Drums | Ted Dyer | |
| Keyboards | Dave Kubinec | |
| Sax | Chris Armstrong? | |
| Trumpet | Phil ‘Coco’ James | |
| Aug/Sep 1967 Germany | Vocals | Adrian Williams |
| Lead Guitar | Vic Johnson | |
| Bass Guitar | Bruno Sampson | |
| Drums | Phil Edwards | |
| Keyboards | Dave Kubinec | |
| Feb 1968 France | Vocals | Adrian Williams |
| Lead Guitar | Vic Johnson | |
| Bass Guitar | Bruno Sampson | |
| Drums | Phil Edwards | |
| Keyboards | Dave Peace | |
| May 1968 to Spring 1969 | Vocals | Adrian Williams |
| Lead Guitar | Mickey Evans | |
| Bass Guitar | Rob Evans | |
| Drums | Cliff Burge | |
| Spring 1969 | Vocals | Adrian Williams |
| Lead Guitar | Glyn Whitcombe | |
| Bass Guitar | Rob Evans | |
| Drums | Cliff Burge | |
| Keyboards | Dave Kubinec | |
| June/July 1969 - Pieces of Mind Break up | ||
Since The Reunion in 2013
| Date | Instrument | Name |
| Jan 2013 – Apr 2013 | Vocals | Adrian Williams |
| Lead Guitar & Harmonica | John ‘Ducksy’ Reardon | |
| Lead Guitar | Vic Johnson | |
| Bass & Rhythm Guitars | Andy Gibbon | |
| Bass & Rhythm Guitars | Robert Price | |
| Bass Guitar | Bruno Sampson | |
| Drums | Ted Dyer | |
| Drums | Phil Edwards | |
| Drums | Steve Strong | |
| Keyboards | Bob Teague | |
| Sax & Flute | Rick Lawton | |
| Sax | Glyn Whitcombe | |
| Trumpet | Phil ‘Coco’ James | |
| May 2013 - 15 Feb 2014 | Vocals | Adrian Williams |
| Lead Guitar & Harmonica | John ‘Ducksy’ Reardon | |
| Lead Guitar | Vic Johnson | |
| Bass & Rhythm Guitars | Andy Gibbon | |
| Bass & Rhythm Guitars | Robert Price | |
| Drums | Ted Dyer | |
| Drums | Phil Edwards | |
| Drums | Steve Strong | |
| Keyboards | Bob Teague | |
| Sax & Flute | Rick Lawton | |
| Sax | Phil ‘Coco’ James | |
| 15 Feb 2014 – 28 Oct 2017 | Vocals | Adrian Williams |
| Lead Guitar & Harmonica | John ‘Ducksy’ Reardon | |
| Lead Guitar | Vic Johnson | |
| Bass & Rhythm Guitars | Andy Gibbon | |
| Bass & Rhythm Guitars | Robert Price | |
| Drums | Ted Dyer | |
| Drums | Steve Strong | |
| Keyboards | Bob Teague | |
| Sax & Flute | Rick Lawton | |
| Sax | Phil ‘Coco’ James | |
| 28 Oct 2017 - | Vocals | Adrian Williams |
| Lead Guitar & Harmonica | John ‘Ducksy’ Reardon | |
| Lead Guitar | Vic Johnson | |
| Bass Guitar | Robert Price | |
| Drums | Ted Dyer | |
| Drums | Steve Strong | |
| Sax & Flute | Rick Lawton |