> [...] I take it the "angle brackets" are the < and > symbols? The > reason I ask is because screen readers often read these out as > "less" and "greater".
Yes. The terminology is a bit unfortunate – indeed, “less than” and “greater than” are the correct names for the ASCII characters < and >, respectively. Angle brackets are actually the symbols 〈 and 〉 (Unicode characters U+2329 and U+232A), but this is not what LilyPond uses for its syntax. Werner