Hammerschmidt was an organist and composer who survived the hardships caused by the Thirty Years War to become a wealthy and successful man admired and respected by his contemporaries – Schütz and Rist both wrote poems lauding him and his music. He was a prolific composer mostly of sacred vocal and choral music publishing more than 400 such works in 14 collections. Most of his works are concertatos and he himself classified his works as either motets, concertos or arias. There's a strong Italianate tinge to much of his music which as he never travelled to Italy I suspect he got from Schütz. That being said it would be a mistake to write him off as "school of" his music may have been influenced by the Italians and by Schütz but he was a vigorous and original composer with a distinctive musical voice of his own. The present work his Sonata super: Nun lob, mein Seel, den Herren is very Italianate it could be inspired by Schütz but I think it more likely that it takes its inspiration directly from Monteverdi's Sonata sopra Sancta Maria ora pro nobis. Whichever is the case it's a beautiful setting of the first two verses Johann Gramann's hymn paraphrasing Psalm 102 (103) in its own right. Enjoy :-).