Google searches can lead you to the most fascinating places. I was looking for "The Blackball Ferry Line", by Bing Crosby & The Andrews Sisters....
found it here, along with hundreds of old recordings from blues, to string band, to Italian opera.
Yes, there is more stuff, one directory up from '78s', but I didn't dare go looking tonight.
(you 'may' have to actually download each one to hear it....I couldn't get them to just play with one click... and there are sometimes several formats to choose from.)

Have fun.....(don't get lost, now.)☺