<human>: What is the difference between a symphony and a string quartet?
<bot>: The main difference between a symphony and a string quartet is in their instrumentation. A symphony typically features a larger orchestra, including woodwinds, brass, and percussion instruments, as well as strings. A string quartet, on the other hand, usually consists of four violins, two violas, and one cello, with no other instruments being used. Additionally, a symphony will generally have more complex musical structures than a string quartet.