Classical Music Ignoramous needs Advice

[Potties]

I´m looking for high quality recordings of the following. Where do I get them?

• Chopin´s Prelude for Piano opus 28 no.4

• Beethoven´s Sonata no.19 in G minor for piano, opus 29, no 1

Would also be good if you could explain what prelude/opus/no.1/no.4 refer to!

I have a recording of the Chopin by Maurizio Pollini which is lovely hold on I will se I can find it for you

here

Thank you so much! I`ve been meaning to get these recordings for YEARS now and have put in the order already!