The "Mlada" project was soon aborted, and Borodin, like the other members of The Mighty Handful who were involved – César Cui, Modest Mussorgsky, and Rimsky-Korsakov – thought about ways to recycle the music he contributed. Of the eight numbers he had composed for Act 4 of "Mlada", those that eventually found their way into (or back into) "Prince Igor" included No. 1 (Prologue: The opening C major chorus), No. 2 (material for Yaroslavna's arioso and Igor's aria), No. 3 (Prologue: The eclipse), No. 4 (Act 3: The trio), and No. 8 (Act 4: The closing chorus).