Caught a few good shows in the past couple weeks: Tortoise at the Black Cat, Mary Timony and Medications at Fort Reno, Les Savy Fav on a quick weekend trip to New York (though 99% of the music I see is here in DC, I’ll go ahead and comment on any out-of-town shows I catch). Some good shows are coming up this week, too, with the highlights being Drive-By Truckers on Friday at the 930 Club and Mirah on Saturday at the Black Cat — but I might be out of town again for the Mirah show, alas. Tortoise …