Amba and Maitreya chanting as part of the birthday celebrations of Sukadev's 50. birthday the mantra Krishna Krishna Mahayogin – do you like to sing along but you do not know the text of this kirtan, you can take this text
Krishna Krishna MahāyoginBhaktānām AbhayamkaraGovinda ParamānandaSarvam Me Vasha Māna Ya
Or you'll find the kirtan as No. 604 in the Yoga Vidya Kirtan Songbook.
This Mantra is for trust (confidence) courage and success. It is a mantra for protection, a mantra against negative external influences such as negative vibrations, thoughts, etc.