@@chrisguerra9501 Hey Chris, I’m not aware of any recordings at the moment, but I have a friend who said he plans on recording the armonia etudes. I’ll check in with him and see if there is any update on that.
I thought the same thing, so I asked John Nieto about it and he responded: “These are the suggested speeds but if it sounds decent slower I’m ok with that.” I feel that 115bpm might be a little more reasonable. Just try to play it fast, but not uncomfortably fast. I wouldn’t suggest any student try to play it at 126bpm unless you are comfortable with doing so.
Do you live in Texas? If so, you’d probably have to ask your band/orchestra/mariachi teacher how to audition. I’ve never auditioned myself for mariachi, so I’m not sure what the process is like these days.