YouTube by its very nature is lossy.
It is not uncompressed audio.
I would advise trying to find the compact disk or vinyl record.
This is what I've used over the years for my CD collection: CD Ripper Software. Easily Convert CDs to MP3 or WAV
I would also suggest visiting your local library for CDs if you don't want to spend money on them.
Use a high quality external optical drive to rip the files from them.

