The oblique (objective) form you functioned previously in the roles of both accusative and dative, as well as all instances after a preposition.
Chris Martin is lead singer, rhythm guitarist and pianist for the alternative band Coldplay. The group has won multiple Grammy Awards over the years, one being for their debut album.
In many bands, such as The Who, Fall Out Boy, Led Zeppelin, Queen and Oasis, the lead guitarist may share spokesman responsibilities with the lead singer. Usually, this is derived from that guitarist's specific role as a co-songwriter, co-founder and/or co-vocalist.