"Schwächen" [Weaknesses] (Bert Brecht), is a work by Juan Maria Solare for any voice and any melodic instrument. It was composed at Köln in November 1993, and lasts two minutes. It was first performed in two versions: by Ligia Liberatori (soprano) and Ulrich Krieger (tenor saxophone), and by Richard Mix (bass) and Ulrich Krieger during the Vacation Courses of New Music in Darmstadt, on 3 August, 1994.