A co-ed group, also known as a coed group,mixed-gender group or mixed-sex group, is a vocal group that includes both female and male singers, usually in their teenage years or in their twenties.
Historically, co-ed groups have not been as common in pop music as girl groups and boy bands. Music industry pundits have pointed out that such groups are difficult to market to the typical target demographic of teen pop acts, namely pre-teen and teen girls. According to music writer Jake Austen, girl groups and boy bands appeal to young girls in distinct ways, with girl groups marketed as role models and boy bands marketed as objects of desire, and mixing the two is "unnecessarily confusing".Slate's Dann Halem echoed this sentiment, adding that "it's hard to croon convincingly about the pop world's staple subject—teen-age yearning and heartache—if you're harmonizing with the object of your affection."
In Asia, co-ed groups are not as popular as girl groups and boy bands, and as a result, there are comparatively few groups of this style.
In South Korea, there are comparatively few mixed-gender groups, with entertainment companies tending to stay away from the co-ed concept. Notable co-ed K-pop groups include Cool, Roo'ra, Coed School, and more recently, K.A.R.D. In his analysis of the K-pop phenomenon, sociologist John Lie attributes this lack of co-ed groups to the "accentuation of gender archetypes" that has "solidified the practice of creating single-sex groups". In "K-pop – The International Rise of the Korean Music Industry" (2015), author Roald Maliangkay concluded that: "The commercial appeal of [their visual] presentation with a specific, targetable male or female audience helps to explain why, even today, mixed-sex non-uniform K-pop groups are virtually non-existent."
In Japan, AAA has been described as "a rare commodity in J-pop in that they are a mixed-sex group aimed at both female teenagers and male music fans."