Growing up with a music loving family has its rewards and downside.
Rewards? All those years hanging around the house on sundays with the Beatles, Frank Sinatra, America and Barry Manilow sure influenced my ears at an early age. Listening to my uncles play the guitar and some 70's rock records (and yes, DISCO) forced my brain to opening up to more genres of music. 
Downside? Having a fairly good memory of things and exposure to different forms of music. Whenever a familiar tune is on, I find myself singing along regardless if the song is cool or baduy, ancient or new.
LSS attack?? Sometimes, you end up singing a song in your head for the rest of the day.
Classic example of LSS triggering an entire soundtrack in my head for an entire day:
Time/ Date: 9 am Saturday, Aug. 9
I enter the bathrom, I hear the neighbor's stereo playing out loud...of all tunes...AIR SUPPLY*! What's even worse was I end up singing in the shower "I'm lying alone with my head on the phone , Thinking of you till it hurts" yada yada yada yikes!!
I get out of the bath and I'm still singing. I go out of the house to get a cab going to QC...and I'm still singing..crap! The hair at the back of my head started to stand...
I finally hail a cab...music this time is Sam the Sham and the Pharaohs' "Wooly Bully." Go 60's classic rock! I start humming along.."wooly bully, wooly bully!"..mixed in with "all out of love" yada yada yikes again!
What's nice about the whole exercise was I remembered Kubrick's Full Metal Jacket and the scene the where the marines entered Hue city. Wooly Bully was the song playing during that scene...
Oh great! Now I'm in soundtrack mode. What classic rock songs from the 60's were prominent in some of the movies I saw before? Hmmm...
I start humming in my head..."Prune Juice, you make my bowels loose..you make everything, groovy..Prune Juice..I think I love ya"..Yeah! The Troggs' Wild Thing. "Wild Thing you make my heart sing!"..from the 90's Major League (with Charlie Sheen, Wesley Snipes and Tom Berenger). Oh wait..one more scene...remembered a line and a scene from a movie. "I once caught a fish this big", then the lead character started singing and dancing to the Kingsmen's 60's hit "Louie louie" . I remembered 92's Dave (with Kevin Cline and Sigourney Weaver).
Ok....now I have a playlist in my little head.I start smiling in the cab and hum by myself regardless of what was playing on the taxi's radio.
Now..Imagine if I grew up with a family of dancers.
*note: a friend said to me that we all go through an Air Supply phase...holy sh#t!
care to listen what's in my head yesterday? sample here.