Answer:
hey, don't worry. So good method for playing the viola in tune: is do some arm stretches before playing. practice playing in the viola tune just don't over push yourself! try some new warm-ups! such as some of the octave scales.
for your second question. try your hardest on your first tune so that you are encouraged to keep going. build up your diaphragm because that is how you should breathe properly when you are singing. instead of singing out of your nose but from your diaphragm. do vocal exercises practicing different octaves to warm up your voice.
Step-by-step explanation:
I hope this helps good luck!!!!