Speaking of breakouts, 2013 has been a breakout year for macklemore & ryan lewis, rocking central park. And now, acclaims and awards everywhere they went. Dan harris went to the dynamic duo about... See More
Speaking of breakouts, 2013 has been a breakout year for macklemore & ryan lewis, rocking central park. And now, acclaims and awards everywhere they went. Dan harris went to the dynamic duo about their amazing year in the spotlight. Reporter: Macklemore & ryan lewis had a wild run in 2013. Their record sold more than 1 million copies. The videos for "thrift shop" and "can't hold us," had a combined 7 million views. ♪ Give you thank you I'm so damn grateful ♪ Reporter: They're nominated for seven grammys. They just wrapped up a triumphant tour. And tonight, they'll play new year's rockin' eve. But right now, as they transition away from the screaming crowds and back to normal life, is when macklemore, also known as ben haggerty, worries about relapsing into the substance abuse that has derailed him in the past. For me, what is a temptation is coming home off of the road. That's why this time period is interesting. Reporter: Right now is kind of -- this is when it's happened before. Reporter: Really. This is when I've fallen back before. Reporter: At its worst, drugs and alcohol landed him in the hospital. And in 2008, in rehab. How bad did it get for you? Isolation, broke, depressed, no reason to really live. Reporter: Did it impact your working relationship. Yeah. We didn't work for the first three years that I knew him. Probably at the centerpiece. Absolutely. Reporter: When macklemore is healthy, his working relationship with ryan lewis, who he met on myspace eight years ago, is more collaborative than many fans might realize. Are you throwing in lyrics sometimes? I'm critiquing lyrics for sure. Critiquing the hell out of my lyrics. Critiquing the hell out of them. Reporter: Does he have a red pen? He might as well. We should get you a red pen. Reporter: One song when lewis weighed in heavily, "same love." I was telling a story about my mom about a gay bully. It started with me writing from the perspective of that kid, trying to take it on from his vantage point. And as usual, I kind of liked what I wrote. Gave it to ryan. And ryan was, you know what? Red marker. This isn't your story to tell. You have a story. You have a vantage point. It's not this. If I was gay, I would think hip-hop hates me. Reporter: That song that takes a hard run at homophobia in the rap world created some backlash. But it was nothing compared to when macklemore brought up trayvon martin on the american music awards. I want to acknowledge trayvon martin and the hundreds and hundreds of kids each year that are dying due to racial profiling. The feedback from that, the hatred in the next 48 hours from that surpassed all of the hatred in the last year from "same love." Reporter: After hustling and scraping to make it for years, saying they admit is sometimes trickier than they thought. Especially the lack of privacy and the exhaustion of the road. Macklemore says he sometimes has to check himself when he has a diva moment. I don't want to look back and be like, you had it all and you weren't even present for it. You weren't able to enjoy it. I want to be here, be now, and be grateful. Reporter: Go watch some behind the music. Check out m.C. Hammer. See how quickly it can go. I'm wearing his jewelry. Reporter: You had me for a second. For "good morning america," dan harris, abc news, new york.
This transcript has been automatically generated and may not be 100% accurate.