Invocation is something every die-hard fan of the upright bass should hear. The excellent techniques and talents of leading avant-garde jazz bassist Mark Dresser are here heard solo, although not necessarily live -- some tracks are overdubbed, and "Trains" includes recordings of (you guessed it) trains. These compositions are all very active, as opposed to minimal, and highlight cuts include Dresser's delivery of the Gerry Hemingway work, "Threnody for Charles Mingus," the title track, and "Polystop for Multiple Solo Bass," both written by Mark Dresser. And while this album may be less accessible than some of the grooves found on Michael Formanek's solo bass release, Am I Bothering You?, Invocation is certainly more varied than Dave Holland's Emerald Tears, and Dresser's performance will not fail to intrigue, astonish, and thoroughly impress those who listen.