Private karaoke booths available to hire at this place - could get pricey though:
http://www.okkaraoke.co.uk/Other places with karaoke on friday:
Regent Inn, 109 Kirkgate LS1 6BY
The Brown Cow, 432 Stanningly Road, LS13 3EF
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theres defusion near gatecrasher area
its a chinese karioke bar, which you can get private rooms if you like. mainly chinese songs but there are alot of english songs.
pretty expensive
lol, 4 months to post that and you do it on the morning after the night out, wp.