Hi Roy,
When i'm searching for songs and free midi-files in the SMF format ,I always use the following web site .
WWW.musicrobot.com

I also use a piece of soft-ware called midi connections (light4.0) available from BCK products they have a web site .

The light connections prog can convert the SMF to actually print out the music notation and even change the Key and also add all the correct chords !!!
I've stopped purchasing music from shops several years ago .
Good look in your search.

Giovanni
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Giovanni