When I started using a DAW and writing music on it, I focused too much on making each track public-ready. Problem was, I was never happy and I end up being stuck on tracks that were going nowhere, preventing me from moving on and make something I would have a better start with. I've shifted that way of thinking recently and accepted the fact that it is okay to experiment and write things that have no plan on making public. So lately, I've been doing more 1-minute tracks, not really full songs, but chord progressions that have only one section. Each time I do this, I change up a progression, try a different key, use different instruments, etc. During this process, I've learned more about the kinds of sounds that suited my taste, what blended well, which progressions I liked. Each time I do this, I bounce the mp3 into iTunes. If I'm ready to work on a song, I could always go back to my iTunes library and expand on one of those tracks I really thought had potential.
I'm sure for every great hit, there are 20 songs written that the artist is embarrassed to show.