I just noticed something crazy about the banjo, and that's if you're playing a C chord, even if you only want to play the top 3 strings, you've got to either mute the D string (or fret the E on the D string), or it will sound like a C/D chord. Or at least it does on my banjo. It's resonating with the G, I guess? Pretty cool. I love just knowing that C/D is so accessible, anyway.
this reminds me of having to mute the low E on a guitar when you play the D major chord