Instruct: Classify Amazon reviews into positive or negative sentiment
Query: various editions of book

I've used this collection since the early 70s for Christmas sing-a-longs. This year, I ordered several used copies from Amazon partners. If you're also buying used copies, be aware that the song list has undergone continuous minor revisions over the years. About a half dozen songs come and go between editions but the vast majority have remained intact. Also, there are several formats: piano/vocal, organ with pedalboard, button organ, etc. Although I haven't done a thorough cross-check, it appears that songs remain in the same keys between formats.