Solo
noun, verbal noun
An alone chant is one you do alone. It's a solo!
どくしょう
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
花粉症なのに、発表会で独唱しなくちゃいけないんです。
Even though I have hay fever, I have to do a solo in the recital.