Possible Clues:

• "To Love Somebody" group
• "Lonely Days" group
• 'Stayin' Alive' band, with 'The'
• "New York Mining Disaster 1941" was their first U.S. hit in 1967
• "Saturday Night Fever" soundtrack singers
• "Saturday Night Fever" group (with "The")
• "How Deep Is Your Love" group
• 'Tragedy' performers
• "Stayin' Alive" artists
• 'How Deep Is Your Love' group