Johann Sebastian Bach was a German composer and musician of the Baroque period. He enriched established German styles through his skill in counterpoint, harmonic and motivic organisation, and the adaptation of rhythms, forms, and textures from abroad, particularly from Italy and France. Bach's compositions include the Brandenburg concertos, the Mass in B minor, The Well-Tempered Clavier, two Passions, keyboard works, and more than 300 cantatas, of which nearly 100 cantatas have been lost to posterity. His music is revered for its intellectual depth, technical command, and artistic beauty.