Those who were musicians, heads of Levite families, stayed in the rooms of the temple and were exempt from other duties because they were responsible for the work day and night.
(1 chronicles 9:33)

When I found this verse in the Bible, it took me by surprise.  All the duties in God's temple are equally important.  Why are musicians specially excluded from other work because they work day and night?

The legendary violinist Jascha Heifetz (1901-1987) said, "If I don't practice one day,...