The Tenth Muse is a jazz quartet with Matt Holman, trumpet; Bobby Avey, Piano; Sam Sadigursky, Saxophone; Chris Dingman, Vibes.   This is one of the series Dimensions in Jazz offered by Portland Conservatory of Music.  Tickets are $5 for students; $10 for seniors, $15 in advance, and $20 at the door.   Advance tickets are available at Jet Video and Starbird Music in Portland and Gulf Of Maine Books in Brunswick or by calling (207)­828-­1310.