Saturday
Development of medieval chant
Lucie Skeaping explores the Abbey of St Gall, its role in the development of medieval chant, and how one of the Abbey's most famous sons - a young monk named "Notker the Stammerer"- came to write a revolutionary kind of music there.
http://www.bbc.co.uk/programmes/b01kjt5k

Sunday
York Early Music Festival
Catherine Bott presents a live show from the opening weekend of the 2012 York Early Music Festival. Festival director (and director of the National Centre for Early Music) Delma Tomlin pops in to chat about the forthcoming festival highlights and there's music from L'Avventura London and their director Zak Ozmo, who perform a selection of 18th-century Portuguese and Brazilian Modinhas.
http://www.bbc.co.uk/programmes/b01kjtw8

Plus
CD Review: New Release at 10:15
Polychoral Splendour: GABRIELI Gabrieli and Schutz
The Word Unspoken: Byrd and Monte
...and a couple of interesting looking projects.
http://www.bbc.co.uk/programmes/b01kjp33