Imogen Holst was a British composer, arranger, conductor, teacher, musicologist,
and festival administrator. The only child of the composer Gustav Holst, she is
particularly known for her educational work at Dartington Hall in the 1940s,
and for her 20 years as joint artistic director of the Aldeburgh Festival. In
addition to composing music, she wrote composer biographies, much
educational material, and several books on the life and works of her father.

She also played the pipe and tabor.

1925 Jane Schofield wrote:

“Amy [Stoddart] did 'Princess Royal' to Imo's accompaniment on pipe and tabor”

Imo is Imogen Holst
‘Imogen Holst – A Life in Music’ by Christopher Grogan (page 27)