1. Gmail doesn't recognize special search characters like square brackets, parentheses, currency symbols, the ampersand, the pound sign, and asterisks.

2. Let’s start by learning the two most common Accidentals: If we take any note, and raise it by a half step, that note is given a sharp symbol, which looks like this: ♯ (similar to a pound sign or number symbol).For example, C raised by a half step would become C♯, pronounced C sharp.F raised a half step would be F♯, or F sharp.