From that time his name appeared on placards in many Russian cities, including Kiev (1912–1914), Saratov (1914), St. Petersburg (1915–1917), Nizhny-Novgorod (1917), Sverdlovsk (1919, 1930), Moscow's Bolshoi Theatre (1929–1932) and Leningrad (end of 1920-beginning 1930).
He made his operatic debut with the Kiev Opera in 1912, and sang there until 1915, when he joined the Petrograd People's House Theatre with a repertoire that included Faust, Rusalka, and Prince Igor.
In 1920 he and his wife, the singer M.N Rioli-Slovtsova moved to Krasnoyarsk,[2] although in 1928 he was appointed professor of solo of singing at the Russian Academy of Theatre Arts and continued his appearances the Bolshoi in a wide variety of operatic roles.
Pyotr I. Slovtsov was called by his contemporaries "the Siberian nightingale", and was ranked with such well-known tenors of the day as Vladimir Rosing, A.M. Davydov, Leonid Sobinov, Dmitri Smirnov and Andrey Labinsky.
Notwithstanding the technical imperfections of the recordings he made, one can tell that the voice of Peter Slovtzov was naturally rich and attractive, of mellow timbre, clear and unique in its strength yet velvet sounding.
Feodor Chaliapin highly appreciated his talent, and they sang together in the operas Prince Igor, Rusalka, Faust, Mozart and Salieri and The Barber of Seville.
For long years the bosom friendship connected Slovtzov with well-known masters of drama as Leonid Sobinov, Nadezhda Obukhova, Vasili Kachalov and Antonina Nezhdanova.
"[citation needed] His best roles included Vladimir Igorevich (Prince Igor, Alexander Borodin), the Prince (Rusalka, Alexander Dargomyzhsky ), Vladimir Dubrovsky (Dubrovsky, Eduard Nápravník), the Indian visitor (Sadko, Nikolai Rimsky-Korsakov), Tsar Berendey (The Snow Maiden, Rimsky-Korsakov), Mozart (Mozart and Salieri, Rimsky-Korsakov), Lensky (Eugene Onegin, Pyotr Tchaikovsky, in 1915), Count Almaviva (The Barber of Seville, Gioachino Rossini), Alfred (La traviata, Giuseppe Verdi), Faust (Faust, Charles Gounod), Romeo (Romeo et Juliette, Gounod), Nadir (The Pearl Fishers, Georges Bizet), Dzherald (Lakmé, Leo Delibes).
Partners on stage included A. M. Bragin, R. G. Gorskaja, L. Lipkovskaja, V. Sokovnin, Antonina Nezhdanova(in Bolshoi Theatre, in Traviata by Verdi, 1928), V. K. Pavlovskaya and M. O. Reizen (in Rusalka), Feodor Chaliapin (in operas Rusalka, Prince Igor, Mozart and Salieri, Faust, The Barber of Seville; the singer presented to Slovtsov a photo dated 31 December 1915 with an inscription: "With kind memories and warm wishes for success in the art world").
From February till April 2011 in Krasnoyarsk has passed festival "Parade of stars in opera", devoted to the 125 anniversary from the date of a birth of the singer.