At Pioneer Works, “Nels Cline’s 70 is the New 70” frames a rock/pop set as a working portrait of a guitarist whose career has moved between experimental scenes and large audiences. Featured performers include Nels Cline, Jimmy Rip, Lee Ranaldo, and EUCADEMIX, each bringing a distinct downtown lineage to the room. The program lands in New York as part of a long local conversation between noise, songcraft, and improvisation. One clear takeaway is how the lineup treats the stage less like a showcase than a meeting point.