Joseph Williams of Toto at Denver Day of Rock, May 26, 2012

Joseph Williams of Toto at Denver Day of Rock, May 26, 2012

Toto vocalist Joseph Williams sings “Human Nature” at Denver Day of Rock, May 26, 2012. The song, penned by Toto’s synth player Steve Porcaro, was a hit as the sixth single from Michael Jackson’s career-defining album, “Thriller.” (Daniel J. Schneider)

Toto vocalist Joseph Williams sings “Human Nature” at Denver Day of Rock, May 26, 2012. The song, penned by Toto’s synth player Steve Porcaro, was a hit as the sixth single from Michael Jackson’s career-defining album, “Thriller.” (Daniel J. Schneider)