Nirvana - Heart-Shaped Box

"Heart-Shaped Box" was first performed live on January 16, 1993, in São Paulo, Brazil. According to the 2001 Cobain biography Heavier Than Heaven by Charles R. Cross, Love courted Cobain by sending a small heart-shaped box to his hotel room while he was on tour. After their marriage in 1992, Cobain adopted Love's hobby, and the couple eventually accumulated a large collection of heart-shaped boxes, which lined the shelves of their many homes. According to Heavier Than Heaven, the original heart-shaped box remained in Love's possession after Cobain's death in April 1994, and contains Cobain's suicide note and a lock of his hair.
It's worth noting that the lyrics of "Heart-Shaped Box" contain references to Cobain's and Love's respective astrological signs, Pisces and Cancer.

(Fonte:Wikipédia)