The Early Music movement, which began in carpentry workshops in university towns 50 years ago, is now a thriving international concern supporting not only star soloists but also whole orchestras to recreate the Baroque. One of the leading lights is the violinist Rachel Podger, who a week on Monday (14 December) will be live on BBC Radio 3 from Wigmore Hall playing the work considered the soloist’s Everest from the era before Bach – Heinrich Biber’s Rosary Sonatas.Podger has devoted a year to these 16 expressive, devotional works, written for the Prince-Archbishop of Salzburg sometime after 1670. She recorded them in January and performs them in December. “For a violinist, they’re a milestone,” she says. “To get them under your fingers, to know the