This has happened to me too and many many times Lee!!!
There are so many songs that sometimes you don't listen for ages and you don't know why...then suddenly you remember those songs and start again....and then you can't stop.
Last time it happened with Milkcow Blues Boogie...I watched the movie "Walk The Line" and I heard it sung by the actor ( ) so I told myself..."Ehi...I haven't listened the original for ages...how it was?".....well...marvellous and a lot better!
Since that day I started to play that song again and again....I "discovered" I like it very much..