Firefox just crashed—blame the two dozen open tabs on my memory-famished laptop—and thanks to the command "Restore Session," every online excerpt from Here in the Moment (Origin), the new disc by singer Gail Pettis, begins streaming simultaneously. I'm agog.

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Instead of a tangled cacophony of spazzed-out drums and glossolalic singing, Pettis's sure, compact voice darts between an odd snare hit or cymbal that has been simmering a mite too long. Heard separately as intended, "Day In, Day Out" capers with grace, and, to my surprise, she makes a case that the overrated staple "Nature Boy" can be more than a sophomoric parable. I'm always a sucker for "In the Still of the Night," but Pettis transforms what is often a lumbering hymn of lust into a frisky flirtation.

When I saw Pettis sing live last November, I was struck by her ease and charm, even in up-tempo tunes. She was an adroit singer when I first heard her several years ago, but now her voice has a smoother, pearl-like quality. Pettis celebrates the release of Here in the Moment (Wed Feb 10, Tula's, 7:30 pm, $10) and returns for Valentine's Day (Sun Feb 14, Tula's, 8 pm, $15) with regular collaborators bassist Jeff Johnson and Randy Halberstadt on piano.

Another terrific singer, Karen Shivers, performs as part of the ongoing series "Jazz & Sushi" curated by Pony Boy Records (Fri Feb 5, Hiroshi's Restaurant, 7:30–10 pm, free). Unlike Pettis, who filigrees her words with a breath or scant pause, Shivers is blunt. With roots in gospel, Shivers has rafter-rattling pipes, but reserves her near-operatic arcs for when the words need to soar.

Esperanza Spalding (Thurs–Sun Feb 4–7, Jazz Alley, 7:30 pm, $26.50) completes this week's trifecta of fine singers. Despite the hype—I wince when she occasionally veers toward smooth-jazz tics—her charisma and excellent, emphatic bass chops burnish a strong, still ripening voice. I'm hoping she'll sing "I Know You Know," which is destined to be a standard (and awaits another brave singer to remold it into a ballad).

Rather than re-create the engaging jumble I heard on my laptop, get a real live jumble with Non Grata (Thurs Feb 4, Chapel Performance Space, 8 pm, $5–$15 sliding scale donation). The orchestral, all-hands-on-deck flagship ensemble of the Monktail Creative Music Concern ranges from blizzardlike free-jazz cacophony to chirping surf rock to wink-and-nod takes on every genre of music. Their goofy parade march of "Pop Goes the Weasel" at the Blue Moon back in 2004 is one of the happiest musical moments I will take to my grave. recommended