Chicago band Wild Belle will close out this summer's free concerts in Millennium Park. View Full Caption Facebook/Wild Belle

MILLENNIUM PARK — Chicago brother-sister duo Wild Belle will close out this summer's free concerts in Millennium Park.

The summer concert series formerly known as Downtown Sound will end at 6:30 p.m. Monday with the funky Chicago-bred band at Millennium Park's Jay Pritzker Pavilion, 201 E. Randolph St.

Sam Trump and Acoustic Audile will open the set.

Comprised of Natalie Bergman and her brother Elliot, Wild Belle uses a psychedelic multi-instrument approach that draws influence from a variety of sources. The band has appeared on "The Tonight Show" and "Conan" and released "Dreamland," a new album, last year.

City officials last year combined the Downtown Sound and Made in Chicago: World Class Jazz series into 18 free concerts.

The show is free and will start at 6:30 p.m. rain or shine.

Aug. 21: Wild Belle; Sam Trump & Acoustic Audile

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