Frances and Courtney, I'll be at your altar
Please keep going Courtney, for Frances
For her life, which will be so much happier without me

from Kurt Cobain – Kurt Cobain's Suicide Note on Rap Genius

Meaning

These lines here deal with Cobain’s wishes for his wife Courtney Love to keep living and being happy for their daughter, Frances Bean Cobain, thinking that his daughter would have a happier life without her father around.

Frances' sixteenth birthday party was suicide-themed and now she and her mother are somewhat estranged.

Conspiracy theories regarding these last four lines are addressed in detail here

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