Answer:

INSONG

AnswerCrossword Clue
INSONGHow a "Glee" character might break out
INSONGLike Broadway musical numbers
INSONGHow Broadway characters may break out
INSONGOne way to break out
INSONGHow some people break out on Broadway
INSONGTuneful way to break out
INSONGTuneful way to celebrate something
INSONGOne way folk heroes may be celebrated