Exhibit 8
                                        September 30 , 1999
 The Associated Group, Inc.
 ▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇
 ▇▇▇▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇
 Dear Sir or Madam:
           Reference is made to the Agreement and Plan of Merger dated as of
 May 28, 1999 (the "Merger Agreement") by and among AT&T Corp., A-Group
 Merger Corp., Liberty Media Corporation ("Liberty") and The Associated
 Group, Inc. (the "Company").  Capitalized terms used in this letter and not
 defined herein have the respective meanings given to them in the Merger
 Agreement.
           This will confirm that Liberty will designate no more than two
 persons to be elected to the board of directors of Teligent prior to the
 consummation of the Merger, as contemplated by Section 3.8 of the Merger
 Agreement, and neither the Company nor any of its Subsidiaries will be
 obligated under such Section 3.8 or otherwise to take any action to cause
 more than two persons designated by Liberty to be elected to the board of
 directors of Teligent.
           Each signatory hereto represents and warrants that this letter
 agreement has been authorized by such party as provided in Sections 10.5
 and 10.6 of the Merger Agreement.
                                        Very truly yours,
                                        LIBERTY MEDIA CORPORATION
                                        By: /s/ ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇
                                           -----------------------------
                                           Name:   ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇
                                           Title:  Senior Vice President
 AGREED AND ACCEPTED:
 THE ASSOCIATED GROUP, INC.
 By: /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
    --------------------------------
    Name:   ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇
    Title:  Executive Vice President
 AT&T CORP.
 By: /s/ ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇
    --------------------------------
    Name:   ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇
    Title:  Assistant Secretary
 A-GROUP MERGER CORP.
 By: /s/ ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇
    --------------------------------
    Name:   ▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇
    Title:  Assistant Secretary