Maybe it's because it's prime vacation time that there's very little activity on the charts-at least in the upper reaches. Biggest loss of momentum comes from Poison which, having shot to No. 2 in four weeks, slips back a place. Biggest forward motion comes just below the top 10, where two albums are moving like proverbial bullets: Winger's sophomore release, In the Heart of the Young, and Banned in the U.S.A., by the ever-controversial Luke Featuring the 2 Live Crew. LAST TOP TEN POP ALBUMS WEEKS ON WEEK CHART

1 1 M. C. HAMMER 25 Please Hammer Don't Hurt 'Em (Capitol) 2 3 WILSON PHILLIPS 20 Wilson Phillips (SBK) 3 2 POISON 5 Flesh and Blood (Enigma/Capitol) 4 4 MARIAH CAREY 9 Mariah Carey (Columbia) 5 6 ANITA BAKER 6 Compositions (Elektra) 6 5 NEW KIDS ON THE BLOCK 10 Step by Step (Columbia) 7 9 BELL BIV DEVOE 21 Poison (MCA) 8 7 KEITH SWEAT 9 I'll Give All My Love to You (Vintertainment) 9 8 MADONNA 12 I'm Breathless (Sire/Warner Bros.) 10 10 SOUNDTRACK 21 Pretty Woman (EMI)

TOP 10 CLASSICAL ALBUMS

1 1 VLADIMIR HOROWITZ 16 Horowitz: The Last Recording (Sony Classical) 2 7 KRONOS QUARTET 6 Black Angels (Nonesuch) 3 5 DIMITRI HVOROSTOVSKY 8 Tchaikovsky & Verdi Arias (Philips) 4 2 LEONARD BERNSTEIN 22 Beethoven: Symphony No. 9 (DG) 5 3 KATHLEEN BATTLE 16 Handel: Arias (Angel) 6 4 CINCINNATI POPS (KUNZEL) 8 Classics of the Silver Screen (Telarc) 7 6 ROBERT SHAW FESTIVAL SINGERS 10 Rachmaninoff: Vespers (Telarc) 8 8 ARTURO TOSCANINI 18 Beethoven: 9 Symphonies (RCA) 9 22 SEATTLE SYMPHONY (SCHWARZ) 4 Diamond: Symphonies 2 & 4 (Delos) 10 10 MURRAY PERAHIA 16 Chopin: Piano Concertos 1 & 2 (Sony Classical)