Backstage before his Lollapalooza debut a couple weeks back, Lamar told Radio.com that his non-stop touring schedule, which includes 19 festivals, was starting to weigh on him. "A little time off would be nice. Two days at least," he said with a smile.

But for anyone who saw Lamar's performance at the Chicago festival, which featured a live band and a crowd-surfing fan in a wheelchair, the rapper didn't seem to be letting his jam-packed schedule get in the way of putting on a good show.

All this time on the road though has made it hard for Lamar to get back into the studio — something he addressed in our interview. He also revealed what fans can expect next from his hip-hop collective Black Hippy and what he really thinks about all those unauthorized "Bitch Don't Kill My Vibe" t-shirts.

Radio.com: In a Rolling Stone profile from last year, you made a comment that you might not release a follow-up to 2012's good kid, m.A.A.d. city. Could you explain what you meant by that?

Kendrick Lamar: I never quite know when I'm going to get back in that studio, you know? It could be tomorrow. It could be a year. It could be two years. It could be tonight. When it comes it will come. That was me saying, 'I don't know when I will get back in there.'

Are you currently writing new music?

Lamar: Yes, I write every day. That's the catch.

Your two studio albums, 2011's Section.180 & good kid, m.A.A.d city, were concept records. Are the songs you've written keeping with that same trend?

Lamar: I don't know. I'd like to do something new, something a little bit different every album. When I get back in [the studio], I think I'll figure it out. But most likely, I wont' stray away too far.

Everyone's interested to know the plan for Black Hippy. Is there a schedule in place?