Question

whose compositions have been included in adigrantha

Answer 1

The first version of the book was compiled by the 5th Sikh Guru, Arjun, at Amritsar in 1604 ce. He included his own hymns and those of his predecessors, the Gurus Nanak, Angad, Amar Das, and Ram Das, and a selection of devotional songs of both Hindu and Islamic saints (notably the poet Kabīr).