About "musical."
Language can be used in all kinds of ways, so I will remain open to uses of "musical."
The logical part of my brain cannot stop hearing the "beg the question" fallacy in the use of the word.
Wikipedia:
To "beg the question" (also called petitio principii) is to attempt to support a claim with a premise that itself restates or presupposes the claim. It is an attempt to prove a proposition while simultaneously taking the proposition for granted.
When the fallacy involves only a single variable, it is sometimes called a hysteron proteron (Greek for "later earlier"), a rhetorical device, as in the statement:
Opium induces sleep because it has a soporific quality.
[The speakers sound good because they have a musical quality.]
Reading this sentence, the only thing one can learn is a new word in a more classical style (soporific), for referring to a more common action (induces sleep), but it does not explain why it causes that effect.