Misc: Who invented the ice cream sundae?

Questions

The Oubangi, Lulonga and Lamami rivers are tributaries of which river?

Holding hands at midnight, 'neath a starry sky' begins which George & Ira Gershwin song?

Tim Allerton & Linnet Doyle are characters from which Agatha Christie novel?

In which film did the actor Sterling Hayden say ' I do not avoid women but I do deny them my bodily essence?

What was the first name of 'Count ' Basie?