Jessica's suggestion of Music Together is a good one. This program is of high quality and is serious about providing a rounded musical experience which is appropriate and relevant to young children. Their group activities feature music and movement, teaching basic rhythms and more.
Also, library storytimes often have some neat little songs and fingerplays too. Ask around to find which libraries have the best librarians or volunteers for this activity... some are great and some aren't as good at managing the experience for the little ones.
Have fun! Don't forget, too, that you can share songs you like with her as well as poetry and nursery rhymes. This provides a foundation of language for her to draw on and opportunities to practice rhythm and inflection (by your modeling this for her). This sort of a language foundation helps to create good writers, too!