Historical clue formulations

• "Blossom of snow," in song — 2021-06-11
• Last song Rodgers and Hammerstein did together (1959) — 2014-08-10
• Alpine flower — 2007-05-22
• Song that ends "Bless my homeland forever" — 2004-08-07
• Flower that's a symbol of purity — 2000-04-07
• "The Sound of Music" song — 1996-02-02