Action & R e a c t i o n is Sandovals first recording as a leader, here togheter whit swedish alto player Fredrik Kronkvist, the french piano player LoïcDequidt and american drummer John Arlnold.

RS4 presents powerfull music; energi and swing. All the tunes are writted by RS except for the folkish Te Quiero Solo by the worlwide chilean composer/artist Violeta Parra. RS4 s music could be described as hardswinging neo bop.