The Robert E. Hendrickson High School Band consists of five concert bands, two winter guards, winter percussion, jazz band, and the Hawk Marching Band. The Hendrickson Winter Guards are eight-time TCGC State Champions, and Hendrickson Winter Percussion finished 3rd at the TCGC State Championships in 2018. Also in 2018, there were ten TMEA All-State musicians from Hendrickson, the most in the band's history. Student enrollment for the 2018-2019 school year is approximately 300 members.
The Hendrickson Hawk Marching Band is a consistent winner of the UIL Sweepstakes award, and has advanced to the UIL 6A State Marching Contest in 2016 & 2018, and the Bands of America San Antonio Super Regional Finals in 2016, 2017 and 2018. In 2016, the Hawk Band also performed in the Macy's Thanksgiving Day Parade for millions of viewers.