I like this idea of connecting music to your art after it's done! ... What happens all the time with me is, I usually listen to music while I'm creating, so usually when I hear that music again later, I'm reminded of the piece...
Sometimes, I actually deliberately avoid listening to certain music while I work so as not to "ruin" it in the future by always having to think of that piece when I hear it again, hehe...
Other times, I create a playlist of new songs that I like and deliberately play it while working.
Same thing happens of course with other activities... Reading a book, building a puzzle, etc =)
Every painting is a journey, which is part of a bigger journey... and traveling without music, well that's just sad. :))