Send this final follow-up in a new email just in case the first email thread got filtered out by their email provider. I recommend leaving about 5 days between the first follow-up and this final one.
(You may also like to follow up with a call at this stage if you collected their phone number.)
Still interested in piano lessons?
I’m just checking in one more time about the lesson opening for [STUDENT NAME]. Did you get my previous email?
If you are interested in that spot, just reply and we can set up a meeting to discuss further. If you’re no longer interested in lessons, or your availability has changed, please let me know so that I can update your information in our system – I don’t want my emails to be a nuisance!