I passed this guy at like Mile 4 of my first marathon so it was 2014. I swore to myself I would stay in front of him no matter how bad I felt in the late miles. I would NOT let the tuba guy pass me. Every so often I would slow down and hear his BUM-BA-BUM coming in the distance and pick up my pace. I was woefully undertrained for that first marathon and he did eventually pass me somewhere between mile 21 and the finish. I always tell the story about how this guy passed me carrying a tuba, when he carried it the whole half marathon the day before as well. He played the Mickey Mouse Club song the whole time, I remember it well.
Edited to add that, maybe obviously, this is the strangest thing I've seen anyone run with as well.