 Complete the following phrase:  In 1957, Swiss musician Bruno Spoerri born 16 August 1935 joined the Metronome Quartet, which became Metronome Quintet, until 1975 when he left. His arrival marked a new era in the group, as even when he left another musician became a member, and so it always remained a quintet until its end in 2013. His arrival was also the beginning of the groups touring in Europe, and later in Japan in the 