A time signature is the number of beats i each bar. eg

means a three quarter note
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true
Explanation:
look at the painting i guess
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Think of it like this: Hip-Hop encompasses Rap in that it's bigger and more broad. When one thinks of Rap, they think of Hip-Hop and vice versa. It's like a nation and what it's known for.
Hope this helps!!
Soooooo good luck because I’m not sure what was said
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There is no specific volume that a player must be at when playing at a forte level, or a mezzo forte. It's up to the creative interpretation; it's up to the conductor and the musicians.
A piano is not always the same. If you're playing a violin concerto, your piano might be a soft but carrying whisper, as opposed to if you're playing an ostinato in a wind band (ugh, alto saxophone parts). This is part of what makes music so extraordinary. There are surely right and wrong ways to do things; an Eb will never be an E, but how you play, your expression, is entirely up to you.