Simplify the following text for a Grade 12 native English-speaking person.
Original: This amateur choir was trained to a high standard , and for the next four decades this was the backbone of the LBS , performing vocal works by Bach as well as his contemporaries including Handel and Telemann , and early Baroque composers such as Heinrich SchÃ 1\/4 tz ( 1585 â `` 1672 ) .
Simplified: The London Bach Society ( LBS ) gave many concerts of Bach 's music , as well as singing music by other Baroque composers such as Handel , Telemann and Heinrich SchÃ 1\/4 tz .