Marian McPartland's Piano Jazz has aired on public radio stations across the U.S. for 30 years. To celebrate, this week's show is a re-airing of the debut episode with Marian and Billy Taylor. The show is always good, but this first episode is full of joy. It's a must-hear for their improvised two-piano jazz duets. Listen to full shows on NPR's website. (The "podcast" of the show is merely excerpts of the interviews and contains almost none of the music, likely due to licensing issues that obstruct many excellent public radio programs from doing full podcasts.)