A Lot of ancient mantras are found in the Saṃhitā part of the Vedas. The Saṃhitās are by far the most historical layer of the Vedas, and include quite a few mantras, hymns, prayers, and litanies. And finally, established a timer for 20 minutes. If it helps to obtain songs https://www.youtube.com/watch?v=7yoEpl90KUg