The answers to the clues below will have something in common.

1. Propose marriage
2. Phrase that's a cousin of "etc."
3. Looking deep within one's self
4. 11:00 p.m. to 7:00 a.m. - for example
5. One often portrayed as simple-minded
6. It stands at the entrance to the Mediterranean Sea

Answers:

1. Pop the question
2. All that jazz
3. Soul-searching
4. Swing shift 
5. Country bumpkin
6. The Rock of Gibraltar 

Each answer contains a word describing a type of music.