What “header” lines may also occur inside the tune?
The E: K: L: M: P: Q: T: V: W: w: lines may also occur within the tune, as well as in the header. Some recent software encourages using […] around such commands, and they can then be placed anywhere within the tune, not just at the start of a new line. Thus [K:Gm] may be used to change the key signature to G minor in the middle of a line. Some abc software might not recognize this syntax yet.
