Original: Although he did not introduce new forms , he enriched the prevailing German style with a robust contrapuntal technique , an unrivalled control of harmonic and motivic organization , and the adaptation of rhythms , forms and textures from abroad , particularly from Italy and France .
Simplified: Nearly all Bach 's orchestral works were written in Cöthen : the Brandenburg Concertos , the violin concertos , the orchestral suites , the solo music for violin and for cello , and a lot of keyboard music for harpsichord or clavichord .