Haram is regarded as "legitimate" musical activity in accordance with mainstream islamic beliefs.

This statement is ‘false’.

Explanation:

Haram means ‘forbidden’ in Arabic.

Regrading music, a number of people in mainstream Islamic culture considers only vocal music suitable for religious songs and identifies it as ‘halal’ (permitted). Meanwhile, the term ‘haram’ used by these people towards instrumental music, which identifies it as ‘forbidden’.