There's nothing inherently wrong in playing a full track in a live set. Its there are plenty of reasons to do it. Going to the loo is a major, major one.. hahahahaha!

But seriously, if im going to do it i usually chop the track up so i can edit and extend on the fly, there are some tracks that i know work a dancefloor. The tracks are my productions and no-one else's.

Which brings me to the other point, I dont like P.A.'s that use other peoples music, or loops from already released tracks that arent theirs. In my book it's dishonest to do this and call yourself a live PA.

Just MO.