The term 'Singing Pair' can be described by two crossword solutions: 'DUO' (3 letters) and 'Vocalcords' (10 letters). A singing pair is a group of two people who sing together, usually in harmony. The word 'DUO' is often used to refer to two people performing together, while 'vocalcords' refers to the vocal cords, which are the muscles in the larynx that vibrate to produce sound when air is directed through them.