Is it me?

When I was studying music therapy at Marylhurst University, we discussed transference and counter transference quite a bit in one of my courses. I remember thinking, “Wait, which one is which?” I admit I still have trouble with the distinction, but I understand, more and more each day, how transference affects the environment.
I see a group on Tuesday mornings. This group is almost always very high energy, and I typically spend a lot of time at the end of the session trying to bring everyone together in breath work (which is to say I want everyone to relax a little before they go out screaming down the halls to lunch). A lot of the people in the group use speech, and some of them sing along or contribute words or phrases to improvisations. Many of the people in the group stand and move in the music or play instruments. Almost always, I leave these sessions feeling nearly jubilant, refreshed even; this group infuses excitement in me that I can say I don’t regularly feel in other sessions.
I walked in this morning and was very plainly sad. I set up my instruments and gear on the table as I always do and I wanted very much to be home. I felt homesick and down. I immediately wondered: Is this me, or is this them? If it’s not me, is it the whole group? What have I noticed walking in today? Is there anything unusual happening today? Has someone died? Is someone ill? Why am I so sad?
This heaviness stayed with me for the whole session, even though the group did not reflect this sadness. I did not hear anything that evoked sadness. No one played anything particularly somber during the check-in. But, one group member had re-joined after having been away for several weeks. This person, though they presented cheerful enough, has always had an irregular and erratic home life and has been in group so infrequently that I wondered whether they would ever come back. I know that they don’t have a lot of support.
I wonder, now as I’m writing, whether the sadness was mine today, or whether is was the group’s, or even that individual’s. Maybe it was both. Maybe it wasn’t. What is endlessly fascinating as well as frustrating about group work is that I won’t ever know.