Gradually, as alternative rock became more "mainstream" (particularly spearheaded by the grunge explosion in the early 1990s), the Modern Rock Tracks and Mainstream Rock Tracks charts began featuring more of the same songs.
Постепенно альтернативный рок стал больше напоминать «mainstream» (особенно после взрыва популярности стиля гранж в 1990-х годах), и чарты Modern Rock Tracks и Mainstream Rock Tracks стали очень похожими друг на друга.