Writing harmony that sounds like radio singers?

Question:

Writing harmony that sounds like radio singers?

I am trying to add harmony part to a line of music, to make it sound like the singers on the radio (you know...W-K-X-P) that sort of thing. Anyone know which intervals and principles to use in order to accomplish this? Or is this actually a type of barbershop harmony (in which case it might be a bit too advanced for the group that is going to sing the harmony part)? Thanks!

Best Answer - Chosen by Asker: Radio singers typically use basic four-part jazz harmony.

Major chord: root-third-fifth-sixth, root-third-sixth-ninth, root-third-fifth-ninth, root-third-fifth-seventh, root-third-seventh-ninth.

Minor chord: root-minor third-fifth-minor seventh, root-minor third-minor seventh-ninth,

Dominant (seventh) chord: root-third-fifth-minor seventh, root-third-minor seventh-ninth, root-third-minor seventh-flat ninth.

These are just a few of the chords available to the genre, but these are the most often used chords, so you should have no problem getting the sound you want.

Note however that you are free to change the voicings to match the melody. For the fullest sound, one example voicing of a G major chord would be:
Bass: Low G, bass clef (root)
Baritone: D, bass clef (fifth)
Tenor: B below middle C, treble clef (third)
Soprano: E above middle C, treble clef (sixth)

I hope this helps you out.