More ways interactive streaming can be useful to musicians:

Lots of musicians make money giving music lessons. They are limited in the number of lessons they can provide by
1) time (only so many hours in a day)
2) distance (only so many local students)

Interactive streaming could also be used for music lessons, because the students could watch and ask questions. Two-way streaming is also possible, so you could also watch the student to see if he/she is using good technique, and offer corrective advice.

This could be accomplished by setting up a session with a "cover charge" (which would actually be the price of the lesson)

Depending on the type of lesson, you could in some cases host multiple students in the same session

You could also expand your territory, being able to offer lessons to grandchildren living in another state, or fans in another country.

think
outside
the
box
there
are
many
possibilities