Notice the double-tracking techniques used sparingly to bolster the choruses. Textural Dissonance
For those interested in exploring the In Utero multitracks, several online resources are available: nirvana in utero multitracks wav verified
If you're looking to create your own music or productions inspired by Nirvana's style, consider using officially released multitracks or stems from other artists, or exploring royalty-free resources. or exploring royalty-free resources.