Conversation so far:
what song was number one on march 30 2014
The song Happy by Pharrell Williams was number one on the Billboard Hot 100 on March 30, 2014.
did pharrell williams write the song happy
The song Happy was written and produced by Pharrell Williams.
how well did the song happy by pharrell williams chart
The song Happy by Pharrell Williams has been highly successful, peaking at No. 1 in the United States, United Kingdom, Canada, Ireland, New Zealand, and 19 other countries.

Question: how were sales
Self-contained rewrite: how were sales of the song happy by pharrell williams