premise: A blond woman in a red t-shirt and a blur wristband sings into a microphone against a green background. hypothesis: A woman is playing the piano in front of a blue background.
contradiction: We can't assume both women are blond and wearing a red t-shirt and blue wristband, and the woman is either playing a piano or sings, she is not presented as doing both. Also the green and the blue backround are of different colors.