Michael Finnissy’s music is hallmarked by its vitality, bold dramatic gestures and radical inventive response to past styles and traditions. Sam Cave, hailed by Sweden’s Gitarr och Luta magazine for the ‘excellent concentration and … sense of honesty and respect’ of his playing, celebrates his fellow composer’s 80th birthday with a new work based on music from 16th-century Spain and the haunting 2021 score, Outcast.