What a strange name for a pen. Music comes to mind more than writing looking at this rollerball.
When it comes down to performance the Pentel Oh! Gel Rollerball does have a constant ink flow. As I write it doesn’t skip, the blue ink (also available in black & red) is sharp & crisp. The rubber grip which incidentally is latex free was a little disappointing. IMO it was lacking in the soft squishy feel of many such grips, hence I didn’t find it particularly comfortable to hold.