Through the years BZN has known several strenghts. In fact only one of the original band members is still in the band at this moment.
Below is a graph that shows during which period the different members were a part of the band:

The members are ordered by the time they are a part of BZN. The person who is/has been a member for the longest time, is placed completely to the left. A blue bar means this person is still a part of the band, while a red bar indicates that this person has already left the band. Below the graph, the different strengths are listed.

This is a list of the different strenghts of the band:

   1966-1967

Jan Veerman - lead vocals
Cees Tol - electric guitar, soprano, flute, acoustic guitars, backing vocals
Evert Woestenburg - electric guitar, backing vocals
Jan Tuijp - bass guitar
Gerrit Woestenburg - drums, percussion, backing vocals

   1967-1969

Jan Veerman - lead vocals
Cees Tol - electric guitar, soprano, flute, acoustic guitars, backing vocals
Evert Woestenburg - electric guitar, backing vocals
Jan Tuijp - bass guitar
Jaap Sombroek - drums, percussion, backing vocals

   1969-1974

Jan Veerman - lead vocals
Cees Tol - electric guitar, soprano, flute, acoustic guitars, backing vocals
Thomas Tol - electric guitar, organ, piano, backing vocals
Jan Tuijp - bass guitar
Jan Keizer - drums, percussion, backing vocals

   1974-1976

Jan Keizer - lead vocals
Cees Tol - electric guitar, soprano, flute, acoustic guitars, backing vocals
Thomas Tol - electric guitar, organ, piano, backing vocals
Jan Tuijp - bass guitar
Jack Veerman - drums, percussion, backing vocals

   1976 (13 weeks)

Jan Keizer - lead vocals
Marie Kwakman - lead vocals
Cees Tol - electric guitar, soprano, flute, acoustic guitars, backing vocals
Thomas Tol - electric guitar, organ, piano, backing vocals
Jan Tuijp - bass guitar
Jack Veerman - drums, percussion, backing vocals

   1976-1984

Jan Keizer - lead vocals
Annie Schilder - lead vocals
Cees Tol - electric guitar, soprano, flute, acoustic guitars, backing vocals
Thomas Tol - electric guitar, organ, piano, backing vocals
Jan Tuijp - bass guitar
Jack Veerman - drums, percussion, backing vocals

   1984-1988

Jan Keizer - lead vocals
Carola Smit - lead vocals
Cees Tol - electric guitar, soprano, flute, acoustic guitars, backing vocals
Thomas Tol - electric guitar, organ, piano, backing vocals
Jan Tuijp - bass guitar
Jack Veerman - drums, percussion, backing vocals

   1988-2003

Jan Keizer - lead vocals
Carola Smit - lead vocals
Dirk van der Horst - electric guitar, acoustic guitars, backing vocals
Dick Plat - organ, piano, accordion, backing vocals
Jan Tuijp - bass guitar
Jack Veerman - drums, percussion, guitar

   2003-2004

Jan Keizer - lead vocals
Carola Smit - lead vocals
Dirk van der Horst - electric guitar, acoustic guitars, backing vocals (at rest)
Dick Plat - organ, piano, accordion, backing vocals
Jan Tuijp - bass guitar
Jack Veerman - drums, percussion, guitar
John Meijer - electric guitar, acoustic guitars, backing vocals (replacement)

   2004-present

Jan Keizer - lead vocals
Carola Smit - lead vocals
Dick Plat - organ, piano, accordion, backing vocals
Jan Tuijp - bass guitar
Jack Veerman - drums, percussion, guitar
John Meijer - electric guitar, acoustic guitars, backing vocals