Here are some of the things I do with my daughter:
I stick coloured stickers on notes middle C, D, E, F, G, A, B (each colour representing a note) and printed out the music note cards from the Tweedlewink website in the matching colours. I show the coloured note card, name the card and ask my daughter to play the note eg. red C.
I also do a lot of rhythm clapping with her, also stomping at fast and slow tempos, playing low and high notes on the keyboard, singing solfege with hand signs and singing songs using solfege. I also do some perfect pitch training on both the glockenspiel and keyboard. Also show presentations of different instruments.
She's exposed to music from different eras everyday and also watches a show which we have on DVDs and videos (we have it here in Australia) called Hi-5, where they do a lot of singing and dancing. Also I do a lot singing around the house with actions.
A helpful website where I got the coloured sticker idea from is
www.musicforspecialkids.com