Born in San Sebastian (1979). Paul has a bachelor's degree in Jazz piano, and his great passion has been Blues, ever since he began with the classical piano at the age of twelve. His first contact with Blues was through the groups of Rhythm & British Blues of the 60s. Playing live since the age of 15, he is currently immersed in the tradition of the Blues piano styles, such as Stride or Boogie Woogie. In 2011, his first solo work, "Tracks", on piano and voice, on the label. Gaztelupeko Hotsak Recording, came to light. Standing out among his influences are, among others, Alan Price, Jerry Lee Lewis, Roosevelt Sykes, Memphis Slim, Otis Spann, Sunnyland Slim, Dr John, Professor Longhair and James Booker.
Along with his group, Stay Blues, he has taken part in various Blues festivals and participated, for five consecutive years, in the Jazz festival in San Sebastian. In the summer of 2007, the band released their first album/CD.
Over the course of his already wide-ranging career, Paul San Martin has collaborated with artists of great relevance, among whom are the likes of, Nico Wayne Toussaint, Otis Grand, Lluís Coloma, James Armstrong, Ñaco Goñi, Slam Allen, Sax Gordon, Chris Ruest and the legendary Blues legend, Billy Boy Arnold. In 2013, Paul, once again, recorded, his latest work on piano and voice, "Paul's mood", a new pianistic venture into the different styles of the Blues but this time on the Gaztelupeko Hotsak recording Company/label.