Questions 1 and 2 are based on this passage

Although Klezmer—a style of traditional Jewish folk music from Eastern Europe—grew from very diverse musical traditions, Roma(Gypsy), Greek, and Romanian elements eventually became so predominant that some scholars refused to recognized klezmer as a separate genre. If one listens closely, however, one can learn to distinguish the sound of a Klezmer interpretation from other related performance styles. Yiddish-speaking Jews routinely use several uniquely descriptive words to identify the sounds found in the Jewish approach to music. Krekht(Yiddish for “groan”)refers to a wailing sound reminiscent of weeping, tshok refers to a laugh-like instrumental sound; and a kneytsh is a sob-like “catch”. These and other elements typical of klezmer are also found in other forms of Jewish musical expression, including cantorial music.