just wondering if anyone else suffers with this, every time i have a vocal lesson/ warm up my voice the tone and quality of my voice changes. i go from sounding very pop to sounding like a very weak opera singer. i find it very weird then about 20 minutes to half an hour later my voice goes back to a stronger better sounding pop voice. i asked my tutor about it and he's never had any other student who suffers from this i just wondering if anyone else suffers from/ can explain why this is happening.
thanks