HASLER or HASSLER, HANS LEO (? 2 ), Ger man composer, was born at Nuremberg, probably in 1564. He was taught by his father, Isaac Hasler, a musician of some stand ing in Nuremberg, and afterwards became a pupil of Andrea Gabrieli in Venice. About 1585 he entered the house of the Fuggers at Augsburg and in 156o was appointed musical director in that city. He next became organist of the Frauenkirche at Nuremberg (1601) and in 1608 entered the service of Christian II. of Saxony. He died on June 8, 1612, at Frankfurt. Hasler is considered the greatest German representative of the Venetian school. His church music is of great beauty but his fame rests on the charm of his secular "songs," which are essentially German in spirit. One of his melodies in the Lustgarten deutscher Ge sdnge : "Mein G'mut ist mir verwirret, das macht ein' Jung/ran tart" was adapted to the chorales "Herzlich tut mich verlangen," "0 Haupt volt Blut and Wunden" and others, and appears no fewer than five times in Bach's Matthew Passion.
Hasler's principal works are: XXIV. Canzonetti a 4 voci (Nurem berg 159o) ; Cantiones sacrae de Testis praecipius totius anni 4, 5, 8, et plurium vocum (Augsburg, 1591) ; Concentus ecclesiastici (Augsburg 1596) ; Neue teutsche Gesaeng, Madrigali (1596) ; Cantiones novae ; 8 Masses (i599) ; Lustgarten deutscher Gesiinge (16oi, re printed in Ges. d. Musik f orschung's publications) Sacri concentus, 5 to 13 v. (Augsburg i6oi) Psalmen u. Gesange (Nuremberg 1607, Breitkopf ; German and Latin secular songs. Three masses are included in Proske's Musica divina, a Pater poster in Rochlitz's Sammlung vol.