Your intuition is sensible, but javascript doesn’t quite work the way you are thinking.
Presumably you want myMusic[1] and myMusic[2] to be the first and second item in the myMusic array?
Firstly, computers start counting at zero, so the reference in the error message to myMusic[1] is actually the test runner complaining that you haven’t set an object as the second item in the array. This is true, you’ve tried to set it as an array that contains an object:
[{.....}]
instead of just {.....}
However, setting each item in the array the way you have doesn’t quite work like that in javascript either.
To simplify, you have an array with one item, eg, [0]
To add to that array, add a comma and the new item eg [0, 1]
The same principle is used whether you are adding strings, numbers or objects - use a comma to separate them.