So last night, my nighttime reading with my daughter included Kevin Henkes' Jessica, which revolves around a kindergartner's imaginary friend.
And this morning, I heard a track off of Justin Roberts' Meltdown! called "Our Imaginary Rhino," which revolves around a youngster's (perhaps in kindergarten, perhaps not) imaginary rhino, natch. It's a catchy power-pop song with a few "na-na-nas" to make for enjoyable singalong action.
You'll be able to listen to samples of every song at Amazon next week when the album is released; for now go here to listen to samples of a half-dozen songs plus a full version of "My Brother Did It," another pleasing power-pop song.
(Truth be told, I prefer Henkes' books about mice to his books about, gasp, real people. Lilly's Purple Plastic Purse is note-perfect, if books can indeed be note-perfect.)