With hundreds of thousands of fans around the country in a frenzy, One Direction is arguably one of the most popular boy bands ever (at least for the current generation).

The popular London–based boy band released their fourth studio album “Four” in the United States on Monday, and it has already sold thousands of copies and rushed to the top of countless charts.

The album follows the release of the band’s first single off the album “Steal My Girl” in September.

One Direction’s latest album boasts a more rock sound than their previous music. Songs like “Change Your Ticket” have a classic feel and may remind the listener of ’90s rock. Other songs like “Fireproof” have a more modern rock sound, with a steady, soft drum beat in the background.

“Four” is much more influenced by the band members as well, with each having more songwriting credits than on previous albums.

While One Direction’s third album “Midnight Memories” was composed of mostly upbeat, pop sounds, the songs on “Four” are much more mature and even somber.

Much of the album focuses on love and relationships, which is not anything new for the boy band, but the songs are less upbeat and more about losing a loved one or dealing with heartbreak.

“Spaces” has lyrics like “The spaces between us/Keep getting deeper/It’s harder to reach her/Even though I’ve tried,” which describes the ending of a relationship and the feelings that ensue during a break up.

The song, “18,” which was written by well-known musician Ed Sheeran, is one of the album’s stand out songs. With lines like, “And all I can do is say that these arms were made for holding you/ And I wanna love like you made me feel/When we were eighteen,” it focuses on being in love with someone and knowing that fact since you were young.

The album “Four” is similar to past efforts, but slight differences and a more mature sound show the band members are growing up. The sound is less happy than previous albums and lingers more on how things change or have changed in the members’ lives.

One thing that the album solidifies is that One Direction has made itself a staple in the world of boy bands. The group will be talked about for years to come, as each album it releases delivers.

The group remains true to itself and provide fans with fun songs that range over different topics and emotions. “Four” is no different, and fans are sure to find a few new favorite One Direction songs to sing along to with this new release.