Question: Which song by David Essex spent 2 weeks on top of the charts?
SQL: SELECT "Song" FROM "2-15940633-1" WHERE "Weeks on Top" = 2.0 AND "Artist" = 'David Essex';

Question: What is the Volume:Issue number of the George McCrae song that spent less than 2 weeks on top of the charts?
SQL: SELECT "Volume:Issue" FROM "2-15940633-1" WHERE "Weeks on Top" < 2.0 AND "Artist" = 'George McCrae';