One idea that has been effective for me in the music room is this clip system. At a former school of mine, all teachers had a laminated poster like this one. (But even if other teachers don’t have one, you could use it.) In the students’ home room classrooms, students had clips with their names on them. However, in the music class, mine were blank.
At the beginning of each class, all clips start on “Go” – and if a student misbehaves, they or I move a clip to “Caution.” That just means “warning.” If a student has to move to “Stop,” that means “time out.” Since only a couple or few students have to move their clips in a given class period, it’s not difficult to remember who had to move the clips. (I would also mark it on the seating chart to help me grade their effort.)
Here are the signs you can use to make your own chart.