I've completed Part Tracks for six of my most popular charts:

Don't You Worry 'Bout a Thing
Scarborough Fair
Fly Me To the Moon
Virtual Insanity
Hide and Seek
Just For Now

Combined, these six charts make up 20% of all my chart sales, historically.  Next in the queue will be Thriller, Someday My Prince Will Come, Sing a Song of Song, More Than Words, I Want You Back, April in Paris and Don't Be On the Outside.  That will represent yet another 20%.  Still, a tremendously long way to go to finish all 118 (or so) charts by May!