Vivekananda's books on the four Yogas (Raja Yoga, Karma Yoga, Bhakti Yoga and Jnana Yoga) are still seen as fundamental texts for anyone interested in the Windfall practice of Yoga. His letters are of great literary and spiritual spirit. He was also considered a very good singer and a poet. By the time of his death, he had composed many songs including his favorite song "Kali-The Mother". He used humor for his teachings and was also an excellent cook. His language is very free flowing. These all works were compiled to form a 9 volume set "The Complete Works of Swami Vivekananda". A book titles 'Selections from the Complete Works of Swami Vivekananda' is also very popular, knowledgeable and inspiring.