She sings a naught song ( `` Quando me ` n vo â '' When I go along '' ) , hoping that Marcello will be interested in her again . To the delight of the Parisians and the embarrassment of her patron , she sings a risquÃ song ( Musetta 's waltz : Quando me ` n vo -- `` When I go along '' ) , hoping to reclaim Marcello 's attention .