It takes him a few minutes to wrap his head around this one. You can see the arrangement he's reading here: http://www.keeper1st.com/music/nyancat.jpg . It was arranged by our friend Vincent Johnson, whose YouTube page is http://www.youtube.com/user/NoveltyPiano
Of course, technically the name of the tune is "Nyanyanyanyanyanyanya!" composed by someone in Japan who is known as "daniwell". His web page is http://aidn.jp and his YouTube page is http://www.youtube.com/user/daniwellaidn He has an album out now which features a few different arrangements of this song as well as several other songs. Here is a video daniwell shot of himself playing it: https://www.youtube.com/watch?v=aQV9zvG4olY
The Pop Tart Cat was a separate entity by cartoonist Christopher Torres a.k.a. "PRguitarman" whose YouTube page is http://www.youtube.com/user/prguitarman1 . The two were merged together (using a remixed version of the song) by YouTuber "saraj00n" to create the bizarre sensation that is known as Nyan Cat: http://www.youtube.com/watch?v=QH2-TGUlwu4
This sight-read was at the end of the March 2012 meeting of the Mother Lode Ragtime Society at the Sutter Creek Ice Cream Emporium, 51 Main Street, Sutter Creek, California. http://www.suttercreekragtime.com
The bulk of Tom's performances from the meeting have been posted at http://www.youtube.com/user/sutterchip