That's an example. There is no clear definition of 'musical' and it can be whatever one associates with it.
Euphonic sound, warmth to the sound (coloration), compressed sound (so you hear decay longer), definitely not bass-shy and/or bright / analytic.
When a recording is well made and the reproduction system is 'transparent' it should sound 'musical', the same system might not be found to be 'musical' on a lot of pop recordings though but sound 'digital/bright/cold' but that's the recording.
In this case the system is 'musical' on some recordings but not on all recordings.
Elevated bass and treble might be preferred by a lot of people. They could consider that musical or more musical.
Regardless where the coloration comes from (transducers, output impedance, BW limiting on extremes, room effects) so if musical (maybe even PRaT = makes someone toe-tapping without doing this on purpose ?) can be caused by several (tone changing) aspects and may well include a strong bias such as: room lighting, alcohol, time of day, knowing there is or seeing tube glow, comfy feeling.
So in that case the question is what aspect makes a system musical or more musical and can people that prefer 'accuracy' not find their system musical.
What technical parameters are responsible and how to define it ? Is it the same for all people or preference ?
The term 'musical' is too vague and one cannot put a finger on it what aspect(s) make something sound more enjoyable/pleasant/musical.