A slave to the rhythm尾斷 Michael Jackson 開頭讀a "sleve"之後又讀a "sthat" 點解個字會唔同左?

When M.J. sings pop songs,on love songs, the blurring become unclear in singing:- according to the rhythm:-
eg:-slave-->sleeve--->She is a slave=She's a slave=she's that="shethat"="sthat"=a shorten version for the shorten rhythm= a linking in idea in such a singing, right.
eg:-something like that---->sthat' or she is a
slave=she is a sleeve--->sleeve for the American pop music, pop groups, pop singer(s), when singer=M.J.