Excellent lesson to benefit the whole mankind using meditation. In Sikhism very close, we focus on sound while meditation. This included two senses "toungue" and "Ears" as long as tongue is uttering and ears are listening meditation goes on. Once tongue is uttering but ears are not listening, you lost the mindfulness and went somewhere else. You bring the mind back to listening "politely". We use the word "WaheGuru". Wahe - while breath in (inhale) - Listen....Guru-breath out (exhale)... Listen. We split because after Wahe (pause) to make sure ears listened to it then Guru (pause) to make sure ears listened to it.
WaheGuru is the "Word" (we believe) is the original sound when the whole Creation begun and it helps to concentrate. Buddhism & Sikhism share very close principals as I know!