The Hellenistic period covers the period of Mediterranean history between the death of Alexander the Great in 323 BC and the emergence of the Roman Empire as signified by the Battle of Actium in 31 BC and the subsequent conquest of Ptolemaic Egypt the following year
It’s all of the above. He created all those things
There's quite a lot of improvisation musicians, such as Richard Grayson, Daniel Roth, and even Beethoven composed an improvisation named, "Rage over a Lost Penny"