Technically, drummers don't make the sounds themselves. The drum shapes and configurations do, and the playing adds nuances to complement that. What if a guy built an electronic drum set, synthesized every sound himself, and played it expertly?
I guess if that met your criteria for artistic expression, then the only thing you'd have left for what makes a band good is whether you liked the style of music... which I think is too obvious a point in a thread that begs the participant to attempt quantifying what they think makes a band effective as good musicians producing good music. If the only qualifying factor of a good band is whether we like the music, then this thread really doesn't need to be very complex.

Singer. Sorry, I guess my phone didn't correct me. And, good joke haha.

B at double L dollar sign is key.

That isn't always necessary. There are plenty of great bands out there that sound alike. If being a good band was to find a way to break new ground, no bands would sound the same. I could be assuming the wrong thing with what you said, but still.

Good music.

Thankyou and goodnight.

Bit of a captain obvious.

There's not much else to it really.

Yeah, that kinda sums it up. But what if there was a band that made crappy music but had very entertaining gigs? Would it be a good band? Considering that an excellent band would make good music and have great gigs. Though I'm not sure if great gigs are important if they make brilliant music.

I'm confused. I'll let myself out.

Isn't the point of the band to make good music? A music show, aka a concert, cannot be good if the music isn't good since in the end, it should all come down to music.

Yes, but this wasn't intended to be a topic clearly obvious. Was leaning towards a more explanatory or opinionated reasons as to what's behind a good band or "good music". More of discussion than anything. Perhaps I should of made the topic clearer or further detailed.