Aliki (Singer)
Attraction (Shadow theatre group)
CEO Dancers (Dance Troupe)
Duelling Pianos (with one pianist)
The Glambassadors (Dance Troupe)
Gospel Singers Incognito (Gospel Singers)
Jordan O'Keefe (Singer/Guitarist)
Maarty Broekman (Singer/keytar player)
Steve Hewlett (Ventriloquist)

And who by?

None by David. Ever.

Duelling pianos by simon.

Duelling Pianos by Simon.

The Glambassadors by Alesha.

I think Robs Duelling Pianos and Maarty by Simon and I hate to say it but maybe Steve.

Don't know about Glambassadors