it really depends for me. I do also play without it, especially if it's an old time gig (I also play a lot of klezmer and swing where I do mostly keep the fiddle under my chin (I prefer to think of it as on my shoulder as I still try to keep my chin from doing any work pressing down). I find that for my body sometimes even when I hold the fiddle lower the shoulder rest can still help me to keep the fiddle snug, but everyone's built differently, so I don't think there's any hard and fast rules about this stuff. Honestly I very often will use multiple of these positions in a single tune, sometimes intentionally to give different muscles a break and sometimes just because it feels right/'happens', or if I wanna change where the fiddle is in relation to a microphone in a performance where I'm also singing. But yes, I started off with classical music, so that may always be my 'default' position. When I first started old time fiddle, I was coming off a year dealing with tendonitis, so was also looking for different ways to reduce the strain on my body, but also it was a choice to force myself to use/inhabit my body differently and get away from all the habitual things I was doing based on decades of classical training. I was definitely influenced by the ideas of the Alexander Technique in this, and recommend researching it to all my students. Thanks for Watching!