Who Sang That 80's Song Sara?

Noelle and I actually went out to Northampton last night, we stopped into the Dirty Truth (a great bar downtown) and had a nice dinner. On the way home we heard that song "Sara" from the 80's and I was convinced it was created by singer / song writer Richard Marx. Noelle though it was performed by Fleetwood Mac or Jefferson Starship. So, we need your help, who sang "Sara"?