sentences:  Although it has been alleged that Ullman's version of "They Don't Know" utilizes the backing track of the Kirsty MacColl original version, Ullman's recording - produced by Peter Collins - was in fact brand-new in all respects, noticeably differing from MacColl's recording by being in a different key, and featuring a slightly faster tempo, a distinctly different arrangement and a guitar solo that differs substantially from the one played on MacColl's version, which was produced by Liam Sternberg.The confusion may stem from the fact that Ullman did use a previously-existing MacColl backing track when recording her own version of MacColl's "Terry" in 1984.