Well, I like it and have very little in the way of critique, but because I'm really anal about these things... Sid, I'd call the whole thing iambic tetrameter, with the first line starting on a headless iamb (acephalous). In the last line, "musical" pronounced clearly does produce a triple foot, though I would scan it as:
of MUS/ ical-CABS/ and MASQ/ uerADE
iamb/ anapaest/ iamb/ iamb
However, when it's read aloud, the last two syllables of "musical" are pretty much elided so they just slip in and it really doesn't affect the iambic tetrameter... unless you're really anal... which only a few of us are.
Having said all that, don't let ANYONE tell you that scansion is an exact science -- even the metric anoraks in their cloisters still find minutiae to bicker over
of MUS/ ical-CABS/ and MASQ/ uerADE
iamb/ anapaest/ iamb/ iamb
However, when it's read aloud, the last two syllables of "musical" are pretty much elided so they just slip in and it really doesn't affect the iambic tetrameter... unless you're really anal... which only a few of us are.
Having said all that, don't let ANYONE tell you that scansion is an exact science -- even the metric anoraks in their cloisters still find minutiae to bicker over
It could be worse