I think that switch from 'of' to 'for' is deliberate. 'Excellence' isn't just sitting there, static; it's to be created (re: "to indicate purpose or advantage") - 'Centre for Excellence' is an abbreviated way of saying 'Centre for the Creation or Discovery of Excellence'. Similarly, 'the home for rock music' suggests more dynamism than does 'the home of rock music'; it conflates the sense of rock music coming to the station to find a home - rather than already being there sitting by the fire - and listeners coming to the station to find rock music.