Coldplay has long been advocating for causes they believe in, and now they're opening up about their work helping people who are deaf and hard-of-hearing be able to enjoy concerts with a concept that Chris Martin says Dakota Johnson introduced him to.The band is promoting an inclusive concert experience that includes offering Subpacs — which are wearable, bass-delivering vests — to hard-of-hearing fans in attendance during their The Music of the Spheres World Tour. During an interview with which aired on Wednesday, Martin revealed it was Johnson who first turned him onto the idea.Grammy-winning band @coldplay is working on making music more inclusive.