Patent ID: 8664504

Claim:
A device comprising: a reading element configured to read a media data format comprising a music data portion defining a music track, and a metadata portion defining metadata associated with said music track; wherein said reading element is configured to read a tempo class value of a tempo metadata type comprised in said metadata portion, said tempo class value indicating a tempo class of said music track; and a selection element which is configured to select a music track associated with a tempo class value based at least partly on a current value of an external activity tempo signal containing information about a measurement or an estimation of a tempo of an external factor provided from a non-exercise related external device, the external factor comprising an indirect measurement or estimation of a current level of stress of a person, located in proximity to hear said selected music track, derived from sensing a behavior of an interaction of the person with a user input device of the external device; and wherein said selection element is further configured to adapt the selection of music tracks based on a tempo change in the current value of the external activity tempo signal containing information about the measurement or the estimation of the tempo of the external factor, so as to select one or more music tracks associated with a first set of tempo class values during a first period of time and to select one or more music tracks associated with a second set of tempo class values during a second period of time.