A musical instrument can provide music, entertainment and education into a home.
Some musical instruments, like a piano, require space and can be very difficult to move around. Other instruments are smaller and quite portable. In addition to the instrument, someone who plays or is learning to play an instrument needs a place to store things like sheet music, a music stand, and things that are used to care for the instrument.
When you have a musical instrument, it's useful to have a quiet place to practice. It may also be helpful to have a place that has enough sound insulation that everyone else doesn't have to listen to repetitive practicing. Not all homes will have an ideal space for practicing, but it's something to consider.