One of my favorites for audio quality is Lyle Lovette's "Joshua Judges Ruth." Originally purchased for the quality of the recording but the music has really rown on me. Another that worked just the opposite is kd lang's "Hymms of the 49th Parallel." I think I'll pop Tonight's the Night out and slap kd in the player.
Another vote for the Johnny Cash mentioned above, especially the first and fourth in the series.
Another vote for the Johnny Cash mentioned above, especially the first and fourth in the series.