BTS co-writes, produces, and composes much of their output. Since their inception, BTS have developed and maintained a style of "fusion music" with an emphasis on hip hop as their musical base largely due to the influence of RM and Suga's background as underground rappers and their main producer Pdogg. Rather than wanting to stick to a specific genre, BTS have introduced brand new elements into their musical repertoire with each new album. BTS' sound began with old-school hip hop influences heard on 2 Cool 4 Skool and O!RUL8,2?, but evolved to include R&B and rock with Skool Luv Affair and Dark and Wild, orchestral strings and electronic dance music with their The Most Beautiful Moment in Life album series, moombahton neo soul, and gospel in Wings and You Never Walk Alone, future bass, Latin pop, and jazz hip hop in their Love Yourself album series and emo rap, rap-rock, Afro pop, nu-disco funk, trap, pop rock and pop-rap in their Map of the Soul album series.