The Rutland Psalter
Folio 8v, King David with harp.
Folio 43v, King David again pointing to his mouth, while a child points to the sky – an analogy of music being heaven-sent?
Folio 45, hybrid creature blowing simple horn and beating drum.
Folio 48v, rebec player.
Folio 49v, goat playing simple horn.
Folio 50, harp player.
Folio 51v, man hitting tambourine, accompanied by a juggler.
Folio 52, man cleaning ear whilst holding what appears to be a rebec, with its back facing the reader. Morgan suggest this to be a bagpipe, though I doubt this, due the lack of pipes distinguishable from the body of the instrument, and the shape being closer to the rendition of rebecs throughout the Psalter than the bagpipes.
Folio 52v, bear playing trumpet.
Folio 53v, centaur blowing trumpet.
Folio 54, rabbit with hand cymbals/bells.
Folio 54v, animal (cow?) with rebec.
Folio 55, King David with harp.
Folio 56v, hybrid creature with bagpipes.
Folio 71, man with bagpipes.
Folio 73v, man with psaltery.
Folio 86v, hybrid with trumpet.
Folio 97v, King David playing organ, with bells suspended above, and an organistrum player.
Folio 98, King David playing harp (possibly tuning), while a man sings, and another plays a trumpet (or shawm?)
Folio 100, rabbit plays simple horn.
See also: http://www.bl.uk/eblj/1987articles/pdf/article11.pdf - Morgan lists a number of musicians and animal-musicians in Appendix B (pp. 176-9), though is no more precise than telling us that they exist (with the exception of the bagpipes).