Rosa's Grandma is sick in bed, and the big chair in the living room is
usually empty now. So is the family's money jar. Rosa is worried: how
can she help? One thing that makes Grandma feel better is hearing Rosa
play music with her friends. She says it makes her feel like a girl
again, dancing at a party. This gives Rosa an idea. If Grandma loves
their music, maybe people would pay to hear them! And that's the
beginning of the Oak Street Band.