How can you have an all time fav song? If you enjoy music, you would start listening to new released music and not have a favorite, becuase you end up finding a song you love and keep listening to.
If you listening to the same cd everyday on your to work or school, you would get tired of it, even if it had your own all time favorite song.
So you have a favorite song only for a certain period of time...until you over use it and move onto different music.
drink that in
I disagree. I always expand my music collection, but some songs really strike a chord (lame pun intended) with you, and you can listen to them often. You don't put it on repeat and rock to it all day, that would ruin the song. It's like a great movie; you can watch it every year or so and re-enjoy it. Except with music it's more like every month 
I went away this weekend, didn't have a chance to check the forums. Going to have to go home and check out these songs after work. Oh, and I forgot... I don't think the song is particularly meaningful, or well orchestrated, but I can and do listen to Journey Don't Stop Believing on repeat. Often.
It's funny -- people really are different. I have listened to basically the same 400-500 songs over and over for the last 30 years. There are very few songs recorded after 1975 that have held my interest. Disco just about ruined popular music for me and nothing in the 80's, 90's, or 21st century has brought me back. I have 2 teenagers (18 and 14) who have done nothing to disuade me from my belief that music died in 1976 (with all due respect to Don McClean who insisted that 'the music died' with the death of Buddy Holly).
Before you take the above too seriously -- know that I realize that I am the narrow-minded buffoon in this discussion and I know there have been many talented musicians since the days of Sinatra, Elvis, Buddy Holly, Bob Dylan, The Four Seasons, Ray Charles, The Beatles, The Beach Boys, Simon and Garfunkel, Herman's Hermits, Aretha Franklin, Gladys Knight, Credence Clearwater Revival, The Guess Who, Blood, Sweat and Tears, The Moody Blues, Cat Stevens, Carole King and James Taylor. But I just seem to be satisfied listening to my own classics over and over and over...