. French composer. He was an associate of humanists and poets in and around Toulouse and evidently had independent means. His three books of secular polyphony (1576, 1578, 1578) include mostly chansons. The texts set in the first two are all poems by Ronsard, many of them sonnets from the Amours. Bertrand's compositions contain much chromaticism and make some use of microtones. Late in life he composed a number of sacred songs, hymns, and Latin motets.