Quidam is a Polish Progressive rock band, evolving from the hard rock/blues trio Deep River, a band formed by Maciek Meller, Radek Scholl and Rafał Jermakow. When Zbyszek Florek and Ewa Smarzyńska joined the band, the original Quidam line up was complete. In this line-up the debut album Quidam was recorded between September 1995 and March 1996. The album was produced with guest appearances of three Collage members: Wojtek Szadkowski, Mirek Gil and Krzysiek Palczewski.
| Career began: | 1991 |
| Members: | Ewa Albering, Emila Derkowska |
| Also known as: | Quidam |