Polyrhythm, a combination of beats offset from each other, is used in music around the globe. The mesmerizing technique is on display during the Poetry in Soundspace Motion event happening this week. Performances include First Nation music from Phillip Meshekey, Jewish ska from mu_Zak and Aboriginal didgeridoo from Rachel Dolma Balunsat. There will also be poetry from Sal Martinez, Gretchen Butler and others, read over the beats to complete the trance-inducing evening, which takes place Saturday, June 20, at the Arlene Francis Center, 99 Sixth St., Santa Rosa. 7pm. $10. 707.528.3009.