The first track of any various-artists compilation bears a heavy burden, required to set the tone for what follows even though the performer had no role in crafting the remainder of the songs. Chris Coleslaw's "Sterling ILL" does this on Hello Quad Cities - Volume 2 with a verse that succinctly repeats a common complaint about the Midwest, and the Quad Cities: "So New York grows / Hollywood glows / Well here in the middle / Well they say it just snows."

Coleslaw's delivery over acoustic guitar is poignant without being doleful - matter of fact yet clearly felt.

The sequencing here is smart - implicitly framing the second limited-edition local compilation as a rebuttal to the argument that our community is a dull dead end and then backing it up with "Sterling ILL" and 11 other exclusive tracks. (Hello Quad Cities is available on colored vinyl only, but each copy comes with a digital-download code.) Last fall's Volume 1 was notable for its consistency, and the follow-up comes close to rivaling it.

Photos from the Water Liars concert (with Break-Up Art and American Dust) at Rozz-Tox on April 10, 2013. For more work by Matt Erickson, visit MRE-Photography.com.

The best teachers inspire as much as they instruct, and Victor Wooten both understands and practices that.

His chops as a performing artist are unquestionable. He won five Grammys with Béla Fleck & the Flecktones - of which he's a founding member - and three times was named "best bassist" by the readers of Bass Player magazine. Rolling Stone readers in 2011 voted him the 10th best bass player of all time - alongside icons from the Beatles, Cream, Led Zeppelin, Metallica, the Red Hot Chili Peppers, Rush, and the Who.

Beyond being an accomplished musician, for the past 14 years he's run music camps for kids, now held at the 147-acre Wooten Woods Retreat in Tennessee. And on April 21, as part of Polyrhythms' Third Sunday jazz series, Wooten will give both a workshop and a concert at the Redstone Room.

He will not teach how to play bass like he does. As he said of The Music Lesson, his fictional work-around to a much-requested instruction manual: "I didn't really want to put out a Victor Wooten method. I don't want to tell people how they have to play."

What Wooten excels at, as a phone interview last week illustrates, is gently knocking down the walls that keep creativity and music bottled up. He said he chose to tell a story in his book instead of writing an instruction manual because it freed him to explore his ideas and philosophy without being tied to facts or technique: "It lets me off the hook right away. ... 'This isn't true.' ... That format allowed me to put more into the book - even things that I can't prove."

The string quartet Ethel refers to itself as a "band" and uses amplified classical instruments and improvisation. It's called a "post-classical" ensemble, and the group has toured with Todd Rundgren and appeared on guitarist/songwriter/singer Kaki King's 2012 album Glow.

Ethel is the very definition of "crossover," and if all that doesn't scare you, try this sample from Pitchfork.com's (strongly positive) review of Heavy, its 2012 record: "The violins peel off into glass shards, and the cello starts moaning. It's a relief from the opening melee, but only insofar as scalp-prickling fear that there is a serial killer lurking in your home is technically preferable to the certainty of being stabbed to death."

At Ethel's April 12 performance at St. Ambrose University, don't expect quite that level of eclecticism. Or violence.

But the Present Beauty program Ethel will play still covers plenty of territory on the theme of "what it is to experience beauty from different angles," said violinist Tema Watstein in a phone interview last month.