After a Replay Music session has been completed and the application closed, is there a way to re-try tagging songs?

I just completed a Replay Music/ Pandora session, and Replay Music quit unexpectedly (after running for many hours). As a result, several songs were not tagged. I'd like to re-launch Replay Music and open the folder from the last session so I can try re-tagging. How can I open a folder from a prior session, or is there an alternate method for tagging tracks?