Wordplay
I am a ten-letter word.
I start with something people do when confused.
In the middle, I contain something you sometimes hear in music.
I end with something found in science terms.
Put me together, and I describe something people have to solve.
What word am I?
What is “question”?
Starts with “ques” — as in “guess” or “quest,” related to confusion or searching.
Middle has “est”, a common sound in words and musical lyrics (and also part of “request”).
Ends in “ion”, a common scientific suffix (like in “motion,” “fusion,” “reaction”).
And a question is something people have to solve — which fits the final line.