I believe this first symbol is a menorah. Hanukkah lamp) is a nine-branched candelabrum lit during the eight-day holiday of Hanukkah, as opposed to the seven-branched menorah used in the ancient Temple or as a symbol.
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Eddie Van Halen uses many techniques, one of which, he does is "double-fretting". Another is "speed-picking".
A piece of music where one part echoes or imitates another part is known as a Canon