Aside from the level of talent involved - Matt Mitchell, piano; Linda Oh, bass, and Dan Weiss, drums - Sonic Halo is unusual in that this session is led by two altos that also "double" on soprano sax.The way Osby's and Postma's lithe lines intertwine it's difficult to tell one from the other, except that Postma has a slightly more tradition-oriented tone (the influence of Liebman on Postma's alto and soprano is evident) and Osby has the more "modern," slightly oblique approach.
Keresman, Mark (2014) HotWax--Album Reviews: Tineke Postma/Greg Osby - "Sonic Halo". In: JAZZed: Practical Ideas & Techniques for Jazz Educators, Vol. 9, No. 6, pp. 36. Available at https://openmusiclibrary.org/article/630204/.