 
 <prompt> ```Why adult contemporary music dey hard to define? Based on di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context:``` <response>: Mainstream AC don evolve for similar way over di years; traditional AC artists like Barbra Streisand, the Carpenters, Dionne Warwick, Barry Manilow, John Denver, and Olivia Newton-John dey find am hard to get major Top 40 hits as di 1980s dey go on, and because of di influence of MTV, artists wey dey staples for di Contemporary Hit Radio format, like Richard Marx, Michael Jackson, Bonnie Tyler, George Michael, Phil Collins, and Laura Branigan don dey crossover to di AC charts more frequently. Collins don dey described by AllMusic as "one of di most successful pop and adult contemporary singers of di '80s and beyond". However, with di combination of MTV and AC radio, adult contemporary dey hard to define as a genre, with established soft-rock artists of di past still dey chart pop hits and dey receive airplay alongside mainstream radio songs from newer artists at di time. 