Exhibit 3.21 BI ACQUISITION, LLC LIMITED LIABILITY COMPANY AGREEMENT Dated as of August 18, 1999 Table of ContentsLimited Liability Company Agreement • July 22nd, 2003 • Business Sound Inc • Services-business services, nec • Delaware
Contract Type FiledJuly 22nd, 2003 Company Industry Jurisdiction
amongCredit Agreement • July 22nd, 2003 • Business Sound Inc • Services-business services, nec • New York
Contract Type FiledJuly 22nd, 2003 Company Industry Jurisdiction
EXHIBIT 4.2 REGISTRATION RIGHTS AGREEMENT Dated as of May 20, 2003Registration Rights Agreement • July 22nd, 2003 • Business Sound Inc • Services-business services, nec • New York
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INDENTUREIndenture • July 22nd, 2003 • Business Sound Inc • Services-business services, nec • New York
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MUZAK LLCGuarantee and Collateral Agreement • July 22nd, 2003 • Business Sound Inc • Services-business services, nec • New York
Contract Type FiledJuly 22nd, 2003 Company Industry Jurisdiction