"Joni 75" would be the second salute to Mitchell to win big at the Grammys. Herbie Hancock's "River: The Joni Letters" won the 2007 awards for album of the year & best contemporary jazz album.
The Grammys' expansion of their definition of traditional pop resulted in a spike in the number of entries in its best traditional pop vocal album category, from 55 last year to 81 this year. More importantly, they've made the category, which Tony Bennett has all but owned over the years (16 nominations, 13 wins), more competitive.
This category was long reserved for albums made up of songs from the Great American Songbook as well as cabaret and musical theater-style songs. But as of this year, the Recording Academy expanded the category to also include (quoting from the Academy's category description guide) "contemporary pop songs performed in traditional pop style—the term 'traditional' being a reference, equally, to the style of the composition, vocal styling and the instrumental arrangement, without regard to the age of the material."
The expansion brought in such entries as the all-star Joni 75: A Joni Mitchell Birthday Celebration (Live), Barbra Streisand's Walls, Elvis Costello & the Imposters' Look Now and Bryan Ferry and his Orchestra's Bitter-Sweet.