Margot Costanzo joined 3MBS as a volunteer in 2007, motivated by her love of all fine music, and is currently the Thursday presenter of Daybreak. Previously Margot presented Vocal Chords, the opera highlights program at 1pm Saturdays, for seven years, taking over from Alastair Jackson. She has presented Wednesday Night at the Opera, Arts Weekly and has also been Executive Producer of Illuminations. She presents a couple of Illuminations programs annually.

Margot is currently a Director of Fine Music Melbourne and co-ordinates the classical music outreach program Music at Your Door.