Background: The early 1990s marked the softening of urban R&B at the same time alternative rock emerged and traditional pop saw a significant resurgence. This in part led to a widening of the market, not only allowing to cater to more niche markets, but it also became customary for artists to make AC-friendly singles.
Question: The resurgence of traditional pop was one of the factors that led to what change in the music market?
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<extra_id_0> widening of the market<extra_id_1>