In 1973, the Beatles (Lennon, McCartney and Harrison) all collaborated with Ringo Starr on their album Ringo. It was three years after the group split, and they met again for a 'reunion'. This is the correct answer because in 1973 Ringo was the only person to have a self-titled album.
Synesthesia is a condition in which someone's sense (for example, hearing) is perceived at the same time, as if by one or more additional senses such as sight.
