Random thought...

Was watching a music channel, and they were showing some classics from the 90's like Salt N Pepa etc. Anyways it got me thinking;

If someone were to write a song that is potential top-ten material, would it still be top-ten material if the song is released not today, but 10 years from now, or even 20 years from now??

Basically, do songs hold their value, provided they havent been released? I know sometimes people re-do other peoples songs (happens quite often from what I can observe).

Anyhoos... just writing my thoughts down.