The site, as you can see, is dedicated to MIDI tutorials and teaching people, for free, the skills to make their own backing tracks.
I do sequence SMFs myself, but have almost full time employment making orchestral rehearsal/backing tracks for my wife (that, and writing tutorials), so not much time is available for other work. I do from time to time sequence files for others but on a strictly commercial basis, the last time was for five movements from a Haydn mass.
Sequencing of pieces such as these from scratch is a long winded process, there are no short cuts, and results can take weeks or even months to complete depending upon the degree of 'finish' required.
If you are looking for MIDI files of popular music, perhaps the best place to ask would be the MidKar forum within Yahoo groups. You may well find that someone there has already made the file, or would be prepared to make it for you.
If you are seeking an orchestral, classical music MIDI file, have you tried Classical Archives (the MIDI section) and the Classical MIDI Connection? There's quite a lot already sequenced there. The Classical Archives require membership, but the basic free membership allows the download of up to five MIDI files per day. CMC is completely free.
You'll find their web addresses in the section 'Web Sites of Interest.'
If you're requirement is for an orchestral work, then if you can let me know what you require, a pdf of the score would allow me to prepare a quotation for you.