Laya Yoga is a kind of yogic meditation where the mind is absorbed in a sound. Laya Yoga is a type of Kundalini Yoga
. Laya refers to dissolution /absorption of the elements, that make up the human body.
Practitioners of Laya Yoga meditate and focus on sounds around and within themselves. Loud, as well as subtle sounds are believed to be heard, during Laya Yoga. Mental activity is believed to stop as one gets involved in listening to the various sounds.
Pranayama has to be practiced for successfully doing Laya Yoga meditation.