Personally, I'd look to Steven Sondheim (and a handful of others) for the "standard" songbook of tomorrow. This is the community of songwriters still working the classic elements of songcraft in IMHO interesting ways. However....
Adventurous contemporary artists (whether jazz, pop, or classical) continue to explore new avenues of expression that may or may not prove long-lived. For me, there's often joy in the exploration and I don't worry about how history ultimately views the efforts.
Adventurous contemporary artists (whether jazz, pop, or classical) continue to explore new avenues of expression that may or may not prove long-lived. For me, there's often joy in the exploration and I don't worry about how history ultimately views the efforts.