Ronaldo Cadeu's Four Pieces for Solo Bassoon, Op. 9, no. 5a is a great option for the performer who wants to include some contemporary music in his / her repertoire. Based on Igor Stravinsky's Three Pieces for Solo Clarinet the present piece explores many different compositional techniques like quartal harmony, twelve-tone, metric modulation and free atonality, without losing track of sense, form and beauty.