album_presenter.description.discover album_name=The Library Of Congress Recordings Volume 7: Mamie's Blues, artist_name=Jelly Roll Morton, records_count=1, countries_count=1, countries=US, media=LP, year_range=1957album_presenter.description.releases album_name=The Library Of Congress Recordings Volume 7: Mamie's Blues, artist_name=Jelly Roll Morton, records_count=1, countries_count=1, countries=US, media=LP, year_range=1957album_presenter.description.countries album_name=The Library Of Congress Recordings Volume 7: Mamie's Blues, artist_name=Jelly Roll Morton, records_count=1, countries_count=1, countries=US, media=LP, year_range=1957album_presenter.description.media album_name=The Library Of Congress Recordings Volume 7: Mamie's Blues, artist_name=Jelly Roll Morton, records_count=1, countries_count=1, countries=US, media=LP, year_range=1957