Final answer:
The term 'blue-eyed' soul refers to a style of soul music predominantly performed by white artists, characterized by its emotional intensity and style rooted in African American soul music.
Step-by-step explanation:
"Blue-eyed" soul refers to a style of soul music performed by white artists. This term came into use in the 1960s to describe white musicians who were influenced by African American soul music. These artists created music that captured the emotional intensity and vocal styles typically associated with soul music, which is known for its emotional, heartfelt lyrics and powerful delivery.
The phrase 'Colour is the keyboard, the eyes are the hammers, the soul is the piano with many strings' beautifully conveys the idea that music, and by extension soul music, is a profound and colorful expression of human emotions played through the interaction of different elements. In the case of blue-eyed soul, it is the artist's unique interpretation and performance that cause vibrations in the soul, irrespective of their racial background.