According to the Internet source given below, Michael Vetter was a German composer, novelist, poet, performer, calligrapher, artist, and teacher born in Oberstdorf , Allgäu.
He experimented with recorder timbres and techniques, such as multiphonics and microtones, inspiring composers such as Louis Andriessen, Will Eisma and Rob du Bois in the Netherlands, Sylvano Bussotti in Italy and others to use the recorder in their compositions.
Vetter died in Munich.

Websites:
	Michael Vetter	Biography by wikipedia.org.

Recorder Sheet Music

Recorder Music: Alto Book 1 (A) Publisher: Universal Edition (UE020736)

Recorder Music: Alto Book 2 (A) Publisher: Universal Edition (UE020737)

Recorder Music: Alto Book 3 (A) Publisher: Universal Edition (UE020738)

Recorder Music: Alto Book 4 (A) Publisher: Universal Edition (UE020739)

Recorder Music: Soprano Book 1 (D) Publisher: Universal Edition (UE020732)

Recorder Music: Soprano Book 2 (D) Publisher: Universal Edition (UE020733)

Recorder Music: Soprano Book 3 (D)  ⇑Publisher: Universal Edition (UE020734)

Recorder Music: Soprano Book 4 (D) Publisher: Universal Edition (UE020735)

Il flauto dolce ed acerbo (D) Instruction & exercises for playing new recorder music. Publisher: Moeck Verlag (MK04009)

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