Digital technology is enabling jazz pianist Art Tatum, who died in 1956, to "perform" again. His music is the subject of a new show at the Apollo Theater as well as a new CD on Sony BMG. John Q. Walker, the founder and president of the Raleigh, N.C.-based Zenph Studios, talks about the digital-era player piano that’s at the heart of this.

Our blog: John Schaefer on the marvel of Zenph's technology

Weigh in: Do you appreciate the sonic improvement of old recordings or do you prefer the scratchy old versions?