These Humans are ...

 Midnight Concert

 A Coon Song

 A Joyous Christmas

 Feline Amenities!

 Untitled

 His First Glimpse...

 Over the Old Tomb...

 There's Many...

 The Moonlight Flit

 To My Valentine

 Stripes to the Fr...

 The Rooftop Party

 The Party Trotted...

 Cats Making Misch...

 If Only Big Thing...

 Preliminary Sketc...