sentences:  He was active as a composer well into his 90s and completed his Requiem, which was his last major composition, when he was 93.Four distinct collections make up the John Donald Robb Archives in the UNM University Libraries' Center for Southwest Research.They are the John Donald Robb Field Recordings, which can be listened to online; the John Donald Robb Photograph Collection, the John Donald Robb Papers, which include original Robb's original music manuscripts, and the John Donald Robb Musical Trust Records.