To learn Barcella - Les Monstres chords, your practice should emphasize these chord progressions: Gm, A, Bb, Gm, Eb, Ab, Bb, Ab, Abm, Bb, Em and Gm. You can use ChordU's Free Tempo controller to start at a slower pace and then gradually increase your speed. Adjust the capo based on your vocal range and chord preference, keeping the song's key of E Major in mind.