Let us all doff our Stetsons for a moment of respectful silence. This week, for the first time since July 21, 1991, Garth Brooks does not-repeat, does not-have an album in the top 10. Of course, we all knew this day would come, but we cannot help feeling a little wistful anyway. Meanwhile, the soundtrack for Aladdin, which has just become the biggest- grossing animated movie in history, sails into the top 10 this week. No genie was required for this magic- carpet ride, just a loyal movie audience and a hit duet, ''A Whole New World (Aladdin's Theme),'' sung by Peabo Bryson and Regina Belle. LAST POP ALBUMS WEEKS ON WEEK CHART

1 1 Soundtrack 10 The Bodyguard, Arista 2 2 Kenny G 10 Breathless, Arista 3 3 Eric Clapton 22 Unplugged, Reprise 4 7 Dr. Dre 6 The Chronic, Interscope/Death Row 5 4 Billy Ray Cyrus 36 Some Gave All, Mercury 6 8 Shai 5 ...If I Ever Fall in Love, Gasoline Alley 7 6 Michael Bolton 17 Timeless (The Classics), Columbia 8 11 Soundtrack 11 Aladdin, Walt Disney 9 10 Wreckx-N-Effect 9 Hard or Smooth, MCA 10 9 Pearl Jam 58 Ten, Epic Associated

NEW AGE ALBUMS

1 1 Enya 61 Shepherd Moons, Reprise 2 2 Ottmar Liebert And Luna Negra 43 Solo Para Ti, Epic 3 5 Liz Story 13 My Foolish Heart, Windham Hill 4 3 Loreena McKennitt 35 The Visit, Warner Bros. 5 4 Enya 192 Watermark, Reprise 6 9 Mike Oldfield 17 Tubular Bells II, Reprise 7 7 Various Artists 11 The Impressionists: A Windham Hill Sampler, Windham Hill 8 8 Peter Buffett 33 Yonnondio, Narada 9 11 Gary Lamb 25 Love Themes, Golden Gate 10 12 Cusco 15 Cusco 2000, Higher Octave