Alright, I recorded a clip of me humming the only part of the song I remember, but it turned out poorly in that it could be from any of the millions of songs out there.
Sound clip
There are words to the song, but I can't remember any of the lyrics. But they are soft, similar to the melody. It was a hit sometime in the 70's, 80's or 90's... perhaps 60's but I doubt that. So it's not some obscure song by a garage band next door or something. So, I guess think about big hits? I don't know! it's driving me crazy.
Also, the song is upbeat and something which was played on FM 97.3 in the SF bay area. They mostly play today's hits, but also play a lot of 80's songs. Here is a sample of their current top 25.
Sheryl Crow
C'mon C'mon "Soak Up The Sun"
Vanessa Carlton
Be Not Nobody "A Thousand Miles"
Norah Jones
Come Away with Me "Don't Know Why"
Jack Johnson
Brushfire Fairytales "Flake"
No Doubt
Rock Steady "Hella Good"
Avril Lavigne
Let Go "Complicated"
John Mayer
Room for Squares "No Such Thing"
Jimmy Eat World
Jimmy Eat World "The Middle"
Chad Kroeger feat. Josey Scott
Spiderman (Soundtrack) "Hero"
India.arie
Acoustic Soul "Video"
Dave Matthews Band
Busted Stuff "Where Are You Going"
Pink
M!ssundaztood "Don't Let Me Get Me"
Dirty Vegas
Dirty Vegas "Days Go By"
John Mayer
Room for Squares "Your Body is a Wonderland"
Creed
Weathered "One Last Breath"
Alanis Morissette
Under Rug Swept "Precious Illusions"
Goo Goo Dolls
Gutterflower "Big Machine"
Puddle of Mudd
Come Clean "Blurry"
311
From Chaos "Amber"
Madonna
Music "Don't Tell Me"
The Calling
Camino Palmero "Wherever You Will Go"
Dave Matthews Band
Everyday "Everyday"
Alanis Morissette
Under Rug Swept "Hands Clean"
Five For Fighting
America Town "Superman"
Kasey Chambers
Barricades & Brickwalls