Songs with background guest vocalists

I'll try to not include duos or duets.

Also not including cases where a singer has other famous (or soon to be famous in their own rights) singers as regular back ups.

Guest vocalists' names are in parentheses:

"Love Affairs" - Michael Martin Murphey (Jennifer Warnes)
"Buried Treasure" - Kenny Rogers (Larry Gatlin)
"Don't Forget Me When I'm Gone" - Glass Tiger (Bryan Adams)
"Love Has Come" - Amy Grant (Bill Champlin)
"Part-time Lover" - Stevie Wonder (Luther Vandross)
"Building Bridges" - Brooks & Dunn (Vince Gill, Sheryl Crow)
"Running With the Night" - Lionel Richie (Richard Marx)
"This is It" - Kenny Loggins (Michael McDonald, Michael Jackson?)
"I Just Can't Let Go" - Ambrosia (Michael McDonald, James Ingram)
"Hard to Say" - Dan Fogelberg (Glenn Frey)
"Honky Tonk Stomp" - Brooks & Dunn (Billy Gibbons)
"Twenty Years Ago" - Kenny Rogers (Bill Champlin)
"Longneck Bottle" - Garth Brooks (Steve Wariner)
"Rockstar" - Nickelback (Billy Gibbons)
"Money for Nothing" - Dire Straits (Sting)
"What a Fool Believes" - Doobie Brothers (Kenny Loggins?)
"Wishing You Were Here" - Chicago (Beach Boys)
"Long Tall Texan" - Doug Supernaw (Beach Boys)
"Keep Coming Back" - Richard Marx (Luther Vandross)

Somebody's Watching Me- Rockwell (MJ and Jermaine Jackson)