Prior to the establishment of the Roman rite with its Gregorian chant. in the Iberian Peninsula and Southern France the Mozarabic rite. with its own tradition of chant. was dominant from the sixth until the eleventh century. https://www.roneverhart.com/Behringer-UL-1000G2-Wireless-In-Ear-Monitoring-System-US-584-to-608-MHz-p31393/