""An Essay On Pennillion Singing: Hanes Ac Henafiaeth Canu Gyda�������r Tannau"" is a book written by John Jones in 1885. The book is about the traditional Welsh folk singing style called ""Pennillion Singing"". The author provides a historical and cultural background of this style of singing, which involves improvisation and the use of a harp or other stringed instrument. The book includes examples...