The L.A.-based, Philadelphia-reared quintet Mt. Joy are probably no one’s idea of millionaire rock stars, yet they’ve been using their platform as one of the rare breakthrough rock bands of the past decade to donate considerable amounts of money to causes that are important to them — including nearly half a million dollars on their recent tour in support of their fourth and latest album “Hope We Have Fun.”

A concert last month in Boston raised nearly $400,000 for Family Reach , a national nonprofit that provides financial resources for families facing cancer. After performing at the Newport Folk Festival in July, they drove to Boston and played an acoustic set at Mass General Brigham Hospital for young patients, and in May did the same at a North Carolina studio for patients from the

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