Novalis (http://www.novalis-music.com/index.cfm) publishes Italian "popular" music (sheet music and CDs). The music ranges from the greats of the waltzes, polkas and mazurkas to Italian-Latin music and straight pop. The CD I have is top quality in production - the only thing to note is the postage they charge pushes up the price a lot.
They stand out for including pdfs of the sheet music, MP3 sound files of the backing tracks (I. E. without the melody, recorded on the CD I have with studio musicians and sounding great) and midi files of the backing tracks, all on the CD. Which I thought was a brilliant idea.
What is even more surprising to me, you can download the sheet music and the MP3 backing tracks, and sometimes the midi files, for free off their website. Amazing. So if any of that is your kind of music, it's a bit of a treasure trove. Personally I might just pick 10 backing tracks and by the time I retire I might have managed to get a little easy listening set together. Thanks to John "Maugein" and Ed "Eman": they drew my attention to the Carlo Venturi memorial concert, I decided to buy the CD/DVD pack and so I found the website.