In 1973, as Thomas' work continued to attract interest, he took on mixing duties with Pink Floyd for their
The Dark Side of the Moon album. In his Mix interview, Thomas claimed he would finish work on the Floyd album at midnight and drive to AIR Studios to do more work on
Procol Harum's
Grand Hotel album until 5 am. Thomas got involved after
David Gilmour,
Rick Wright,
Roger Waters and
Nick Mason could not agree how the album should be mixed: Waters and Mason wanted a dry and clean mix, using the nonmusical elements, while Gilmour and Wright wanted a more subtle mix, with an emphasis on echo. Wright denied that there were any violent arguments. In 1993, Gilmour described Thomas' role on as a referee for arguments between himself and Waters: "[We] argued so much that it was suggested we get a third opinion. We were going to leave Chris to mix it on his own, with
Alan Parsons engineering. And, of course, on the first day I found out that Roger sneaked in there. So the second day I sneaked in there. And from then on, we both sat right at Chris's shoulder, interfering. But luckily, Chris was more sympathetic to my point of view than he was to Roger's." Gilmour's recollections are disputed by Thomas: "There was no difference in opinion between them. I don't remember Roger once saying that he wanted less echo. In fact, there were never any hints that they were later going to fall out. It was a very creative atmosphere. A lot of fun." "The overall sound was pretty much dictated by what was on the multitracks," observed engineer
Alan Parsons. "I don't think the mix necessarily revolutionised what was there. If you were to play the multitrack tape now and put the
faders up, it would sound like the
Dark Side of the Moon we all know. So, no, I wasn't aware of any conflict of that kind. But the plus side of Chris being brought in was in solving any problems between the band at the time of mixing. He was like a
mentor, a guiding light and
intermediary." In any event, Thomas's involvement resulted in both Waters and Gilmour being satisfied with the final release. He also synchronised the echo on "
Us and Them" and was at the session for "
The Great Gig in the Sky". ==Recording sessions with Badfinger==