Some of my parents' records that were favorites included Fiddler (OBC)and the soundtrack to My Fair Lady. Also 1776, and The Rothschilds, which I know was in the house before I started purchasing records.
They also had a compilation released by Columbia, called "Broadway's Best" It was one record as I recall, but might have been two because it was in a gatefold album, with production photos and little blurbs about each of the shows inside. I remember the cover had little Hirschfeld's of all of the performers in the shows featured on the album. I specifically recall "The Party's Over" and "I Enjoy Being a Girl" being on the album, and a number from So. Pacific (I am pretty sure it was "Some Enchanted Evening"), but right now don't recall the others. Maybe "Rain in Spain"
My father, when he was still living at home, was big on Readers Digest collections, of light classical music. (His taste has become more discerning since then, as his second wife is much more of a heavy-duty classical music lover.) That is how I recall being introduced to the Boston Pops and Tchaikowsky, and orchestral music in general. Which I still much prefer to chamber, instrumental recitals, or classical vocals. In music, as with much of life, bigger is better in my book.

I think I have mentioned it before, but the first album I ever purchased with my own money was the OBC of MAME, bought at the Korvette's in Sheepshead Bay, Brooklyn.