[BC] Top 40 is not always from "Billboard"

[Thomas G. Osenkowsky]

When examining research data, it is extremely important
to 'consider the source' of that data. In the case of music,
was the data based on sales, airplay, club play or a
combination thereof? Billboard is nationwide, so a local
strong airplay/sales song may have minimal impact on the
overall sample. A student with an A grade and three D's
and two F's will still fail overall. That student may perform
very well in one subject but fail most others. Can he/she
be considered stupid?

Some examples: Here in CT there was a song by the group
Sonoma called "Love For You". A huge hit but never made
Billboard. Same for Cashman & West "King of Rock & Roll".
Songs that were popular in New Haven and Hartford, CT were
never aired in New York. There are no doubt countless others.
On Rhino's 'Super Hits of the 70's Hav A Nice Day' vol 3
there is a song by Punch called Fallin' Lady. I never heard of
it. It was a huge hit on KHJ, but unheard of back East.

Of course we must also which chart(s) a song has appeard on. 
Then there are crossovers, etc.

Tom Osenkowsky, CPBE