Bogenstrich. Liebes-Lied. Liebes-Lied. Bogenstrich. A love song. A love song full of sadness. A piece for piano and cello. The German poet Rainer Maria Rilke published the poem “Liebeslied” in 1907, and the British composer Sir Harrison Birtwistle put his meditations over that love song to music between 2006 and 2009. He gave it the title “Bogenstrich” (bowstroke), an allegory that Rilke uses in the poem.