Weaving classic soul, confessional songwriting, and pop polish, English singer Adele has become a global phenomenon, breaking records and collecting accolades since the 2010s with her powerhouse vocals and all-too-relatable songs. Beginning with her 2011 sophomore set, 21, no singer could compare in terms of sheer sales or stardom and Adele existed in a different stratosphere than her British or American peers, selling tens of millions of albums at a time when many musicians struggled just to get to a million. The key to Adele's appeal lay in her sly, subtle execution, first h...