Former Led Zeppelin frontman Robert Plant is struggling with writing new music.

In a new interview, Plant announced his upcoming tour with Alison Krauss, and said he’s been “going through all that stuff that I never released and never quite got finished.”

When asked if he’s been working on new music, Plant said, “I’ve got a Tascam digital recorder, and I sing, and I put the vocals through a guitar pedal, and then I record them on that over there, and it sounds great. Why bother to go to the studio? But I can’t find words. This is a very difficult time to try and wax lyrical out there.”

Plant also said he isn’t ready to think about retirement just yet explaining, “For me, the continuum must keep going. Today, I was pulling all my lyric books out and going, ‘Gotta get the groove back. I’ve got something to say.’ So yeah, I’m going to keep going — as long as they’ve got effects machines that make me sound good.”