Absolutely. Sometimes I get totally stuck...or I sort of finish but without really liking what I finally managed to put together. If I go back, especially a long time later, like even years, it's all new. Kind of. I'll get completely new and different (and hopefully better) ideas. Sometimes, though, I discover there's something really good in the original and I have trouble believing I actually came up with that myself!
I have one I'm planning to go back to soon, in fact. I found it, was almost amazed by what I had written so far (so much so that I looked up the original inspiration, thinking I must have copied it--I didn't), and decided it needs to be finished. So I'll be working on it again. I started it a couple years ago or so.
I'm looking forward to hearing your old/new song!
Vicki