I'm in a band and I love playing with the guys in my band, but sometimes when I try to jam with other people it's just impossible to make it sound like music. I'm not sure why though. I think maybe some of them have no rhythm, or they aren't able to follow me and are expecting me to follow them instead. Also played with a keyboard player who, it was actually impossible for me to feel any kind of rhythm in what he was playing, it just sounded like arrhythmic nonsense, but then he suggested a beat for me to play and I played it and he was able to lock in with me. It's bizarre to me how common this seems to be, and these aren't novice musicians but more like people who usually do singer/songwriter type stuff and play their own instrument and sing as like a solo act. I'm not sure what to do about this other than trying to force them to play with a metronome.