\version "2.19.65"
<<\chords {
b2:m ~ b8:m a4.
}>>
\version "2.19.82"
<<
\chords {
\set chordChanges = ##t
b2:m b8:m a4.
}
\chords {
b8*5:m a4.
}
\chords {
b2:m s8 a4.
}
>>