This Zikar (zikr) was Hazrat Inayat Khan's personal Zikar that he gave to his mureeds as a keystone Sufi practice.
His son, Hidayat Inayat-Khan writes in his book "Reminders":
The word ‘Zikar’ means ‘Remembrance’. The remembrance of the ‘All Pervading’, while losing oneself in the folds of a most sacred experience, which no expression could ever describe, and which can only be experienced when one is prepared to forget the self. The basic Zikar Meditation consists in the repetition of the ancient sacred words ‘La El La Ha El Allah Hu’, which means ‘None exists save God. God alone is.’
Listen to the music used to accompany the Singing Zikar. Once started, all four parts of the Singing Zikar will play in order.