Barry Manilow is in a mellow mood on "The Greatest Songs of the Seventies," his third volume of decade-driven covers albums. Due Sept. 18 via Arista, the project will be available as an 18-track single-disc set and as a two-disc set with a 14-song Dual Disc and a nine-song bonus audio CD.

For the single-disc package, Manilow focus on contemplative fare such as Simon & Garfunkel's "Bridge Over Troubled Water," Carole King's "You've Got a Friend" (a duet with Melissa Manchester), the Carpenters' "(They Long To Be) Close To You" and Barbra Streisand's "The Way We Were." Rosie O'Donnell is featured on an interpretation of Elton John's "Don't Go Breaking My Heart."

This version will be rounded out by acoustic versions of eight vintage Manilow tracks, including "Mandy," "Could It Be Magic?," "Copacabana" and "Somewhere in the Night."

Manilow's two prior "Greatest Songs" albums have sold nearly 1.7 million copies in the United States combined, according to Nielsen SoundScan.

Here is the tentative track listing for "The Greatest Songs of the Seventies":

"The Way We Were"
"It Never Rains in Southern California"
"My Eyes Adored You"
"You've Got a Friend" (duet with Melissa Manchester)
"The Long and Winding Road"
"How Can You Mend A Broken Heart?"
"Sorry Seems To Be the Hardest Word,"
"(They Long To Be) Close to You"
"Don't Go Breaking My Heart" (duet with Rosie O'Donnell)
"Bridge Over Troubled Water"
"Sailing"
"He Ain't Heavy, He's My Brother"
"Could It Be Magic?"

Acoustic songs:
"Mandy"
"Looks Like We Made It"
"Even Now"
"Weekend in New England"
"Somewhere in the Night"
"Can't Smile Without You"
"Copacabana"
"This One's for You"
"I Write the Songs"