Barenreiter TP419 - Johannes Brahms Sextet, Op18 in Bb, Study Score. The two string sextets (op. 18 and op. 36 [BA 9420, TP 420]) by Johannes Brahms are amongst the high points of the Romantic string repertoire and some of the most popular chamber music works of all. The new Bärenreiter Urtext editions, edited by Christopher Hogwood, are the first scholarly- critical editions of these much-performed works.