Kirtan Sohila is a collection of hymns of Guru Nanak ji, Guru Amardas ji and Guru Arjan Dev ji. These hymns underline the pains of parting of human beings from God and the bliss to be achieved when one unites with God again.

By Giani Thakur ji.
This prayer was composed by Guru Nanak ji sometime between 1500-1507. It is recorded at the start of the Dhan Dhan Sri Guru Granth Sahib Ji. It explains how the barriers of deceit and falsehood can be broken in life and how to become one with God. To relate and connect with your soul. Recite in the early morning or when your being is endangered, when the radiance of your soul is weak, when your soul feels sad. All wisdom of the Siri Guru Granth Sahib is contained in this Bani. Related to ether element; it is read to attain Brahm Gian (Knowledge of God)

Rehras Sahib is collection of hymns of five different Gurus. The Rehras as recorded in the Guru Granth Sahib contains hymns of only Guru Nanakji, Guru Amardas ji, Guru Ramdas ji and Guru Arjan Dev j.
Chaopaee is Guru Gobind Singh's personal prayer for protection and is to liberate the soul.

This Shabad is by Guru Nanak Dev Ji in Japji Sahib on Ang 8 of Sri Guru Granth Sahib Maharaj: