The term 'singing ability' (SL.) can be summarized as the capacity to produce melodic sounds with one's voice. It is a skill that has been around since ancient times, and is still highly valued today. The crossword solution for this term is 'pipes, ' which refers to the vocal cords, which are responsible for producing sound when air passes through them. Singing ability is a combination of physical and mental abilities, and requires practice and dedication to master.