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Glenbrook South High School Instrumental League (GBSIL)Glenbrook South High School Instrumental League (GBSIL)
One Band, One Family
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  • Contact
  • Home
  • Calendar
  • Programs
    • Marching Band
    • Concert Band
    • Jazz Band
    • Pep Band
    • Indoor Percussion
    • Beyond Band
  • Fees
  • New Members
  • Middle School Families
  • GBSIL Parents
    • The GBSIL Organization
    • Volunteering
    • 2022-2023 Board
    • Board Roles & Descriptions
    • Fundraising
    • Band Trip
    • GBSIL Bylaws
  • Contact

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