Keyboards player, Grant Medici, finally concludes "von" is German (12)
Explanation below:
Keyboards player = definition (with an emphasis on the plural, to be technically accurate)
Grant = ACCORD (see Collins, meaning 8)
Medici, finally = I
concludes "von" = ON
is German = IST
which tells the story, revealed to me last night by a cat of my acquaintance, of an ill-educated band member, possibly of Italian extraction, getting to grips with languages. The cat is very uncool.