Misc: In 1843 British arrest Irish nationalist ---------- O'Connell for conspiracy. ?

Questions

This keyboardist collaborated with Neil Schon & wrote the miami vice theme?

This Madonna video was #1 on the Art Of Video countdown?

This man brought us "Delilah" and "It's Not Unusual."?

This man created the Motown Empire & wrote many songs.?

This Michigan hitmaker sang "Turn the Page" "2+2" & "Hollywood Nights".?