“Glass Song” shows how successful trios can be in staying away from the boring threesomes that haunt lobbies and small clubs. “Glass Song” — with no reference to composer Philip — consists of 10 originals by pianist Eckemoff in a more-contemplative, sometimes-moody manner. Drummer Peter Erskine helps to provide a good sense of rhythm and percussive effect. The album has almost a chamber-like sound. On both, an individual approach to music stands out.