Historical Recording

I couldn't figure out how to search the Library of Congress so instead I listened to a recording of Frank Sinatra's "My Kind of Town" that was an original recording. I noticed that the sound was a little fuzzy but I felt it enhanced the song because it gave it a quality that could only work for music from before the Beatles. I know the explanation is confusing, but it feels like to me that after the Beatles, the sound of music improved and that's how it should be for that music, but Frank Sinatra, Nat King Cole, Bing Crosby all sound so much better when it's an original recording. There was little amount of bass and was short on the treble which gave it almost a neutral tone in a way. I definitely enjoy the sound quality of the song.