When weirdo psych-pop tunesmith Syd Barrett departed in 1968, the thought of Pink Floyd as a viable singles act pretty much died. Besides "Another Brick in the Wall (Part II)," which topped the charts in 1979, the group sold few copies of the smattering of singles they did release. Then again, chart position is quite misleading when determining the popularity of certain Floyd songs. Classic rock radio has been incessantly spinning "Comfortably Numb," "Wish You Were Here" and "Have A Cigar" for decades. Surely these have become greatest hits by now, right?