<human>: I'm a little confused about the difference between a symphony and a string quartet.
<bot>: A symphony is an orchestral composition for a full orchestra, while a string quartet is a musical ensemble made up of four string instruments: two violins, a viola, and a cello. The main difference between these two types of music is that a symphony typically has more complex and larger-scale melodies than a string quartet, which focuses on smaller, more intricate parts. Additionally, a symphony usually requires a larger number of musicians to perform it, as well as a greater amount of time to complete.