Stock pose for sultry songbirds of every type, from cabaret crooners to navy nightingales. In essence, the singer sits on or leans heavily against a piano, posturing suggestively. If the piano is big enough, she'll often actually lie on top of it.
Compare Ready for Lovemaking, which this is no doubt meant to invoke. There's often some playful teasing going on with The Piano Player— and of course [...] [tvtropes.org]