Focus
Groep uit Amsterdam met o.a. Jan Akkerman, Thijs van Leer en Pierre van der Linden (ook in Brainbox, de Leo Koster Band en Advanced Warning).
1969
- The shrine of God / Watch the ugly people
(Philips JF 336 061) [Ramses Shaffy met Group Focus]
1970
- Why dream / Happy nightmare
(Imperial 5C 006-24220)
1970
- House of the king / Focus
(Imperial 5C 006-24250)
1971
- House of the king / Black beauty
(Pink Elephant PE 22 542)
1971
- Hocus pocus / Janis
(Imperial 5C 006-24415)
1972
- Sylvia / Love remembered
(Imperial 5C 006-24607)
1972
- Sylvia / House of the king
(Polydor 2001 422)
1972
- Sylvia (mono) / Sylvia (stereo) [promo]
(Sire SAA-708)
1972
- Tommy / Focus 2
(Imperial 5C 006-24629)
1972
- Tommy / Sylvia
(Disc AZ SG 392)
1973
- Hocus pocus / Sylvia
(Imperial 5C 006-24697)
1973
- Hocus pocus 2 / House of the king
(Polydor 2001 453)
1973
- Hocus pocus / Hocus pocus II
(Sire 704)
1974
- Hocus pocus / Sylvia - Love remembered
(Polydor 2294)
1973
- EP Mammoth - The smile / Jumbo - Hocus pocus [flexi]
(Sonopresse SHOL 2094) [A1: Kayak - A2: Brainbox / B1: Dizzy Man's Band - B2: Focus]
1974
- Harem scarem / Early bird
(Polydor 2058 466)
1974
- Harem scarem (mono) / Harem scarem (stereo) [promo]
(Atco 45-7002)
1975
- Mother Focus / I need a bathroom
(Polydor DP 1980)
1975
- My sweetheart / Mother Focus
(Polydor 2058 692)
1976
- P's march / Focus V
(EMI PRH 14)
1976
- Hocus pocus / House of the king
(Polydor 2135 016)
1976
- House of the king / O avondrood
(Polydor 2001 640)
1977
- Glider (Planeador) / Focus V
(Reflejo C 006-25721)
1978
- Eddy / Sneezing bull [promo]
(EMI ID 07) [Focus with Proby]
1981
- Sylvia / Hocus Pocus
(EMI 1A 006-26768)
1985
- Sylvia / Hocus pocus
(EMI G 4539)
1985
- Beethoven's revenge / Who's calling
(Vertigo 880 827-7) [Jan Akkerman & Thijs van Leer: Focus]
1987
- Sylvia / Hocus Pocus
(Old Gold 9696)
(met dank aan Ko Aker)