Johann Sebastian Bach: The Complete Works for Keyboard, Vol. 9 "Köthen, 1717-1723 - The Happy Years"

Musique ancienne (French for “early music”) denotes the historically informed performance of medieval, Renaissance, and Baroque repertoire on period instruments and with period-specific techniques. Rather than a single historical style, it is a practice and aesthetic: performers consult original sources, treatises, and surviving instruments to recreate articulation, ornamentation, tuning, tempo, and ensemble balance as they likely sounded before the Classical era. Hallmarks include gut strings, low and flexible pitch standards (e.g., A=415 for Baroque, variable for Renaissance/medieval), meantone or well temperaments, natural trumpets, cornetts and sackbuts, recorders and traversos, theorbos and lutes, viol consorts, organo and harpsichord continuo, and an emphasis on dance rhythms and text-driven phrasing. Today the term also implies an interpretive ethos—clarity of counterpoint, rhetorical delivery, and stylistic diversity across centuries—applied to sacred and secular works from monody and polyphony to dance suites, madrigals, and early opera.