Well I wouldn't say there is a best song, but more popular songs. But by listening to the more popular songs you are missing out on the more obscure gems. Like I had never gotten Somewhere in Time by Iron Maiden, no one ever talked about it. Everyone talks about number of the beast but Somewhere in Time is like my second favorite Maiden album. Two of my faves on there, The Loneliness of the Long Distance Runner and Wasted Years.
The real thing to ask for is what are the better albums to listen to then branch out from there. Plus if you're planning on downloading the music (which I'm sure the majority of people do who ask for songs) then you should download the full album anyway. This isn't 1996 anymore you can download the whole thing, I won't tell.