Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

glenn branca (october 6, 1948 – may 13, 2018) was an american avant-garde composer and guitarist.
glenn branca

kappa (uppercase/lowercase Κ κ), is the letter of the greek alphabet, used to represent the "k" sound in ancient and modern greek.
kappa

wikimania is an international conference on wikis like wikipedia.

wikimania

