Question: Cyril Havermans is a Dutch musician, best known for being in the progressive rock band, Focus,  a Dutch rock band formed in Amsterdam in which year, by keyboardist, vocalist, and flutist Thijs van Leer?
Sentence (from "Focus (band)"): The band have undergone numerous formations in its history; since December 2016 it has comprised van Leer, drummer Pierre van der Linden, guitarist Menno Gootjes, and bassist Udo Pannekeet.
Relevant evidence: No