He lived at a time when the piano was becoming a popular instrument and the harpsichord was becoming old-fashioned. J. C. Bach wrote a lot of music for the piano and gave the very first concert of piano music in London in 1768. He wrote 6 keyboard concertos and dedicated them to the Queen. The last movement of Concerto no 6 was a set of variations on "God Save the King". This became a very popular piece of music at the time. He wrote many songs that became popular in his time. They were often performed in Vauxhall Gardens, a park where many people went to be entertained.