Dancing in the Moonlight

Just wanted to add that i have heard corgan play dancing live and he said it was by faith lindsay.. i dont have this single but you might want to look at who the author is... just to give credit where credit is due.. the version i heard was wonderful btw

Disarm + 2 Quality B-Sides

Billy Corgan's 'Disarm' is one of the Smashing Pumpkins best-known songs, and for good reason. It features intelligent and touching lyrics, and very emotive music. The video clip fits the song perfectly, matching the whimsical and bittersweet mood of the song.
This single is a gem because of the quality throughout. Both 'Landslide' and 'Dancing In The Moonlight' are amazing tracks, and show how the Smashing Pumpkins can cover a song and make it their own.
'Landslide' is a Stevie Nicks cover and is the highlight of the Smashing Pumpkins' 'Pisces Iscariot' B-Sides collection. It is Corgan at his best, with emotional, soaring vocals and powerful music. It is 100 times better than the recent Dixie Chicks cover. Sometimes I wonder how this song was never a #1 single...
'Dancing In The Moonlight' is the final track, and for most Pumpkins' fans, the reason for purchasing this single (seeing as it isn't on any other album). It's an awesome track (also a cover) and holds true to the restrained and moody feel of the cd. A friend of mine lists this as his favourite Smashing Pumpkins song. Corgan's beautiful vocals compliment the melancholic instrumentation, adding to the overall mood.
Anyone who picks this up will be thoroughly inmpressed - I was lucky enough to come by it in a second hand cd store. This is why the Smashing Pumpkins were as great as they were.

Source of Dancin' in the Moonlight

What a great song Dancin' in the Moonlight is, to answer the question as to its source, it is a cover of a Thin Lizzy song.