Westlake High School is a 2,400 student high school in the Eanes Independent School District just west of Austin, Texas. The Westlake High School Chaparral Band has won the Texas State Honor Band three times in its 30-year history. The Honors Band has consistently earned University Interscholastic League Sweepstakes trophies for superior performances in Marching, Concert, and Sight reading competitions and has performed at the prestigious Midwest Band and Orchestra Clinic in Chicago, Illinois. It marched in the Rose Parade in January 2003.  It performed in Carnegie Hall in March 2005 and April 2009 and at the 2006 American Bandmasters Association Convention in Richardson, Texas. Its wind ensemble was the first ever high school band invited to perform at the bi-annual WASBE international conference in July 2009. It swept the top awards at the 2007 Duncanville Marching Invitational in Duncanville, Texas. In Fall 2008, the Westlake High School Marching Band finished in the Top Ten in Texas State UIL Finals competition, placing it in the top 1% of all Texas high school bands.

The music program in Eanes ISD begins in pre-K, and the band program in the sixth grade. The district includes one senior high school (grades 9-12), two middle schools (grades 6-8), and six elementary schools (grades K-5). Directors in the band program specialize not in age levels, but in particular instruments.

Each fall, the Chaparral Band and Westlake Band Parents Association host the Westlake Marching Festival on the second Saturday in October. This full day of marching activities features back-to-back marching presentations by an average of 20 of the top high school bands in Texas in pre-UIL competition. The Westlake Marching Festival is recognized as one of the major marching competitions held in the state with awards presented for excellence in Musicianship and Program Performance along with trophies for Best Color Guard and Drum Line Performances.

The Westlake Band was organized in 1969 by James Hejl, and developed under the direction of Lee Boyd Montgomery, Jr., Gerald Babbitt and Van Ragsdale. Kerry Taylor has served as Director of Bands since 1989.

The band has traveled throughout the United States, Canada, Europe, Japan and China to perform at various clinics and festivals and has received numerous awards. The 2009 Chap Band numbers more than 240 members, which is the largest in the school's history.