Well-worn paths are the easiest to navigate. Thomas Keemss leads Percussion Project Saar, an ensemble based at the Hochschule für Music Saar, in this collection of often-performed concerti/solo works with ensemble: David Mancini’s “Suite for Drum Set and Percussion Ensemble,” Ney Rosauro’s “Concerto for Marimba and Percussion Ensemble,” John Beck’s “Concerto for Timpani and Percussion Ensemble,” Emmanuel Séjourné’s “Concerto pour Vibraphone Solo et Ensemble de Percussions,” and Bob Becker’s “Mudra.”