YouTube has lots of Martha Argerich recordings. Really poorly-encoded recordings uploaded in low quality. All of ArgerichHD's audio content is encoded directly to AAC-LC 192kbps (YouTube's native audio format) from FLAC sources and embedded in 1280x720 H.264 .mp4 files so that no further compression or transcoding takes place. There are other pianists worth listening to besides Martha, I suppose, so this channel features some of their recordings, too.