The Megamix Golden Age is the period of Belfield FM after Thomas O'Mathuna was usurped as Station Manager by Willem McCartney. It is named so after Willem's famed Spotify Playlist the "Willem Megamix" which often filled the station's airwaves before and after broadcasting started. BFM prospered during this period due to the relative competence of its committee and general membership, most of whom had been producing radio shows for while, thereby giving little cause for controversy or upheaval during the period.

This era is often defined by the station's relative ability to "run itself".

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