We tend to look back to the OBCR's to gauge our remembrances of the greatest musicals. I, along with historians, would argue that SHOWBOAT is one of the very greatest musicals, turning the tide in the way that musicals are created. For me, the studio cast recording conducted by John McGlinn is the best available recording of SHOWBOAT. It is so good.
I saw MY FAIR LADY when I was 15 and was aware that this original production with Rex Harrison, Julie Andrews and Stanley Holloway was something very special. It fittingly played the beautiful Mark Hellinger. I can remember my parents sitting quietly in the living room listening with rapt attention to the OBCR. Incidentally, I feel that the mono version of the NY cast is superior to the London stereo version; there is so much more energy in the OBCR. In those days, cast albums were made on the first Sunday after the opening (no Sunday matinees back then), so the cast was fresh from the opening. The OBCR of MY FAIR LADY also has John Michael KIng singing "On the Street Where You Live", superior to the different London singer.
Which leads us to GYPSY, certainly one of the greatest musicals ever, withstanding different interpretations and usually coming out on top, with the exception of the Sam Mendes production which played with the raw emotions of the musical without having any fun. I bought the OBCR of GYPSY before seeing it for the first time and got so excited about it that I would count the days before seeing it. Reading in the liner notes that "Rose's Turn" was something special, I purposely did not play that track, preferring to be surprised by the live performance by Ethel Merman. For me, the OBCR is definitive.
Although the question wasn't asked, there are two guilty pleasures which I absolutely love, two flops with great scores: GOLDILOCKS with Elaine Stritch which I saw twice in the 1958-1959 season, and I HAD A BALL which I did not see, whose extremely brassy score is infectious.
"Madam Rose...and her daughter...Gypsy!"