What is your question here? Wav files can be compressed and converted to smaller files, you know. For that, there should be enough topics about music conversion by now, findable with the [search].
When you're looking for free songs to use, there are, if I remember correctly, and most likely I do, also several topics in this very subforum.
So yeah, your point with opening yet another topic that is not really descripive and thus helpful and would by that have a real point of its existance?