An accordion breathes in and out as it plays, so it is read as the rhythm of expansion and contraction in life. It is also linked to folk gatherings, dancing and bittersweet nostalgia.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.