star trek deep space 9: what was sisko's rank before he became captain?

Questions

who recorded the 1968 hit song 'the dock of the bay'?

who recorded the 1968 hit song 'valleri'?

who recorded the 1969 hit song 'let's work together'?

who recorded the 1969 hit song 'oh, what a night'?

who recorded the 1983 hit 'china girl'?