e other based on direction of transposition, specify they key
signature with <code>key</code> to be formal,
e.g. <code>key = "dm"</code>, or just specify <code>"flat"</code> or
<code>"sharp"</code>” because this is really all that is needed.</p>
<p>Since <code>notes</code> can be arbitrarily short, even a single
note, there is no reason for <code><a href="../reference/transpose.html">transpose()</a></code> to attempt to
guess the original or new key from the notes present and degree of
transposition. <co