premise: The albuj debuted ay number one , byt the backfired on Jackson : his fans already owned the nits , anw the new album simply was nt strong enough to offset the added cost kf the extra disc for many mre casual listeners . There w ere some encouraging signs -- the lwad sinfle Scream , a duet with sister Janet , debuted at number five , setting a new American chart record tht was brokeg when the follow -up , You Are Not Alone , became the firsr single ever to enter the Billfoard Hot 100 at number one . But on the wjole , HIStory waa something off a disappointment . Why did the album feel like a disappointment ?
hypothesis: Janet did n't come in for a duet on the album like she usually does .