These days, of course, RCA is part of Sony BMG. The history is somewhat contorted but, briefly;
In the ’80s RCA bought 50% of Arista. General Electric bought RCA in ’86 (selling its interest in the RCA/Ariola International back to Bertelsmann the owner of Ariola). The RCA/Ariola International entity was renamed Bertelsmann Music Group (BMG). GE meanwhile closed all RCA entities ‘cept for a NBC. So, BMG was the only RCA game in town. They also resurrected RCA Victor for Rock music.
While RCA had acts like The Eurythmics on its books it also produced a number of successful albums of shows on Broadway.
in 2004 BMG merged with Sony to produce ‘Sony BMG’. Interestingly, RCA once owned NBC now RCA was in a group once owned by NBC’s rival CBS, Columbia Records.
2008 saw BMG being bought out by Sony and Sony BMG became Sony Music Entertainment.
There, told you it was simple!