This week’s rains brought with them an added benefit: they cooled things off just enough to allow for a perfectly comfortable evening of free music under the big Texas sky. The Bob Bullock museum’s annual “Music Under the Star” series is back again, gracing our ears every Friday in July at 6 pm with al fresco performances from some of the Lone Star State’s finest under the museum’s iconic star. This week, Kelly Willis and Ruby Jane grace the stage with neotraditionalist country leanings and killer fiddling chops. The show starts at 6; consider arriving early with a blanket or lawn chair to snag a spot and enjoy refreshments from local vendors. Yet another reason to TGIF.