Their fan base continues to grow across not just Michigan, not just the U.S., but around the world, and they haven't even released their first album. Here's everything the band told us about it from the band themselves.

We caught up with the rocker foursome from Frankenmuth, Michigan on Thursday, May 24, 2018, the day after their second sold-out concert at the Fillmore in Detroit. Currently the band is on a U.S. headline tour where every show sold-out in advance.

They released their debut studio EP in April 2017 and their double EP this past November. That double EP, "From the Fires," reached No. 1 on the Billboard U.S. Hard Rock Chart and their first single, "Highway Tune," reached No. 1 on Billboard's Rock Radio Chart for five consecutive weeks.

SEE THE VIDEO OF OUR UNEDITED VIDEO WITH THE BAND

So what about the new album? "Absolutely all new music. All original full-length album," said bass player Sam Kiszka. "It's more songs on one album than we've released on the double EP together," added lead singer Josh Kiszka. "We recorded it in December, January, February. That was the down time to do that after the holidays."

Josh says fans won't have to wait long for it to come out. "We're reshaping it and then get into mastering and hopefully release it soon. It's looking like late summer."

The band tells us they recorded the album in Nashville, but also portions of it in Detroit. "A little bit here," said Sam. "We did some guitar and dubs and some vocals. Actually, one of the songs was recorded in Detroit."

Greta Van Fleet has one more concert at the Fillmore on May 25 before headed overseas to Germany, the U.K., the Netherlands and France before returning to the U.S.

They also teased a show in 2018 at the FOX Theater in Detroit, but aren't saying anything about that yet. It's a total secret, even though the sign said they were playing there in 2018. We'll just have to wait a little longer to find out when.

We'll have more in our interview with the Michigan rockers in the coming days on MLive.com.