Why do people no longer talk like this? How is this kind of "intonation" or way of speaking called?

[youtube=https://www.youtube.com/watch?v=GDHRXNEGokw][youtube=https://www.youtube.com/watch?annotation_id=annotation_185843&feature=iv&src_vid=CfOoMlojtbo&v=N2ipKq54LJg]