Contemporary American music for wind band is among the most varied, colorful and brilliant to be heard anywhere, not least when performed by one of the genre’s leading young ensembles. Pulitzer Prize winner Joseph Schwantner is represented by his evocative concerto “Luminosity.” David Maslanka has helped to reshape the wind band sound and “Hosannas,” some of which are based on chorale melodies, are full of moments of self-reflection. These qualities of quiet and timelessness are shared by the first movement of Steven Bryant’s “Alchemy in Silent Spaces.”