SECOND SUPPLEMENTAL INDENTURE

Exhibit 4.23 - Second Supplemental Indenture, dated as of November 28, 2016, to Indenture dated as of February 23, 2011, among certain subsidiary guarantors named therein, Wilmington Trust, National Association, as trustee, and Deutsche Bank Trust Company Americas, as collateral agent, paying agent, registrar, authentication agent and transfer agent.

Second Supplemental Indenture (this “Supplemental Indenture”), dated as of November 28, 2016, among Clear Channel Metro, LLC, TTWN Networks, LLC and TTWN Media Networks, LLC (each a “Guaranteeing Subsidiary” and, collectively, the “Guaranteeing Subsidiaries”), each a subsidiary of iHeartCommunications, Inc. (f/k/a Clear Channel Communications, Inc.), a Texas corporation (the “Issuer”), Wilmington Trust, National Association (successor by merger to Wilmington Trust FSB), a national banking association, as trustee (the “Trustee”), and Deutsche Bank Trust Company Americas, a New York banking corporation, as Collateral Agent, Paying Agent, Registrar, Authentication Agent and Transfer Agent.

WHEREAS, the Issuer has heretofore executed and delivered to the Trustee an indenture (the “Indenture”), dated as of February 23, 2011, providing for the issuance of an unlimited aggregate principal amount of 9.0% Priority Guarantee Notes due 2021 (the “Notes”);

WHEREAS, the Indenture provides that under certain circumstances each Guaranteeing Subsidiary shall execute and deliver to the Trustee a supplemental indenture pursuant to which each Guaranteeing Subsidiary shall unconditionally guarantee all of the Issuer’s Obligations under the Notes and the Indenture on the terms and conditions set forth herein and under the Indenture (the “Guarantee”); and

WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows:

(1) Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

(2) Agreement to Guarantee. Each Guaranteeing Subsidiary hereby agrees to provide an unconditional Guarantee on the terms and subject to the conditions set forth in the Indenture including but not limited to Article 10 thereof.

(3) No Recourse Against Others. No past, present or future director, officer, employee, incorporator, member, partner or stockholder of each Guaranteeing Subsidiary or any of its

direct or indirect parent companies shall have any liability for any obligations of the Issuer or the Guarantors (including each Guaranteeing Subsidiary) under the Notes, any Guarantees, the Indenture, any Security Document or this Supplemental Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by accepting Notes waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Notes.

(5) Counterparts. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement.

(6) Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

(8) Subrogation. Each Guaranteeing Subsidiary shall be subrogated to all rights of Holders of Notes against the Issuer in respect of any amounts paid by such Guaranteeing Subsidiary pursuant to the provisions of Section 2 hereof and Section 10.01 of the Indenture; provided that, if an Event of Default has occurred and is continuing, each Guaranteeing Subsidiary shall not be entitled to enforce or receive any payments arising out of, or based upon, such right of subrogation until all amounts then due and payable by the Issuer under the Indenture or the Notes shall have been paid in full.

(9) Benefits Acknowledged. Each Guaranteeing Subsidiary’s Guarantee is subject to the terms and conditions set forth in the Indenture. Each Guaranteeing Subsidiary acknowledges that it will receive direct and indirect benefits from the financing arrangements contemplated by the Indenture and this Supplemental Indenture and that the guarantee and waivers made by it pursuant to this Guarantee are knowingly made in contemplation of such benefits.

(10) Successors. All agreements of each Guaranteeing Subsidiary in this Supplemental Indenture shall bind its Successors, except as otherwise provided in the Indenture or in this Supplemental Indenture. All agreements of the Trustee in this Supplemental Indenture shall bind its successors.

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed, all as of the date first above written.