Alright here’s a great craft for older kids, but I think it would still be fun with a toddler. Make a musical scale using water and plastic bottles. This link gives directions for how much liquid needs to go in each bottle to make an octave scale (DO-RE-MI-FA-SOL-LA-TI-DO). I would recommend using water, but a drop of food coloring may be fun for certain ages or if you are OUTSIDE to avoid stains 
This would be a great tool to teach the science behind sound or a lesson on musical scales. If you don’t have any musical background the article gives a couple examples of melodies, or let your child explore and create their own. There are benefits to playing a set melody for concentration, but it’s also important to let kids improvise and use their imaginations. Let me know if you get a chance to try it and we’d love for you to share pictures, recordings, or a YouTube video! I would definitely give you extra giveaway entries.
That looks like fun. We'll have to try that sometime.
I love doing this!!
Thanks for the link! I am glad to have that resource, although Skedaddle (aka DH) regularly delights in making things up as he goes.
I like the "Music Mondays" category. I haven't seen anything like it in the other blogs I frequent.