(Reuters) -Spotify's founder-CEO Daniel Ek will become executive chairman in January, the Swedish music streaming company said on Tuesday as it named longtime executives Gustav Soderstrom and Alex Norstrom as co-CEOs. Ek, who has served on Spotify's board since 2008, will focus on capital allocation and long-term strategy in what the company called a European-style chairman role. Here are five key facts about Spotify's new co-CEOs: GUSTAV SODERSTROM * Soderstrom holds a Master of Science degree in elec ...