interesting, lingle.
she used to not be able to tolerate anyone else singing with her - probably due to over-accuracy on her part, athough could also be down to wonky sensory issues - if she sings she can't hear/hears she can't sng, iyswim, as she is happy to listen to imperfections in singing when she is trying to learn a song. she is currently back in a phase where it is ok to sing along with her, and she enjoys singing together after school.
we did do a lot of call/response both with singing and storytelling when she was younger, but not singing/playing call/response. that is certainly something to think about.
she is intrigued by the voices on her ipad, and asks me who they are, where they are now/what they are doing.
she will pick out songs on the radio too and sing along (one of her earliest vocalisations was 'beeee beee ceeeee raaaaaaadiooooooo twooooooo'
) - it can be surprising to hear what she sings along to having heard it on the radio, and she has started requesting songs for her ipad when she hears them in the car.
she knows the note names, and can place/find them on a keyboard. she struggles with two hands/chords due to motor skills deficits, btu we are going to be working on that next (probably just a root note for left hand, rather than a chord)
mostly I just wish I could easily help her fulfil whatever potential she has with this - we have a houseful of musical instruments and music, and dd2 is learning cello currently, with choral work about to follow - I just happened across my mum's old school recorder books when I was 6 or so and taught myself to read music etc etc - wish it could be so simple for dd1 too.