Umm, yeah mostly Catholics. I'm Catholic... but other christians do it as well... not sure which denominations.
It's kind of odd because I think more people show up for ashes than nearly all other important Christian days of importance, except Christmas.
I'm getting the hang of playing hymns via bluetooth. It took a lot of practice to get it right.. fade in and out.... mostly not having a smartphone notification, like RAMS KUPP INTERVIEW, start ding-a-linging over the speaker system right during Mass.... yes, that happened to me.