P. Beinaris is also known as a composer, who created over 100 different works: hymns, masses, cantatas, songs for choirs and soloists, music for organ and orchestra; in 1947 wrote Requiem. His hymns "Kas, kas", "From the shipwrecked ship", "Your defense", "Ecce sacerdos", "You speak with your lips", "I hail you, Mary", "My prayers are said to you" etc. became popular.After Lithuania regained its independence, he created the "Resurrection of the Nation" and "Rebirth of the Nation" masses. His hymns could be conditionally divided into Advent, Lent, Easter, Eucharistic, Marian and others. He mainly composed vocal music based on the verses of Bernard Brazdzionis.in 2006 for his services to Kaunas in the field of culture, he was awarded the Santaka badge of honor of the third degree.
