I think Stephen Bray, who helped launch Madonna's career (and who was a fellow member of the band 'Emmy & The Emmys') and who produced this album, wrote a better intro than any I could, so I'll copy it here.
Amen to that; though Bray's keen production ears can pick out flaws my normal set can't, so don't be put off by his disclaimer. The sound quality is actually pretty good and it is a testament to his skill as a producer that tape hiss has been reduced to a negligable minimum.