The term 'Lonely Boys' is a reference to the American rock band, The Everly Brothers. The Everly Brothers were a duo of brothers, Don and Phil Everly, who had a string of hits in the 1950s and 1960s. Their most famous song was 'Bye Bye Love', which was released in 1957. The Everly Brothers were known for their close harmonies and their influence on other musicians. The crossword solution for 'Lonely Boys' is 'LOS', which is an abbreviation for Los Angeles, the city where the Everly Brothers were born and raised.