Hard to believe, but it’s been nearly four years since Solange Knowles last put out an album — 2012’s “True” — and that was only an EP. The last time the singer put out a full-length studio album was 2008’s Sol-Angel and the Hadley St. Dreams.”

The singer’s latest album, “A Seat the the Table,” features a return to her sound from the “True” album and includes a large number of collaborations. While some of the guests featured on the album need no introduction, such as Lil Wayne, Andre 3000, Kelly Rowland and Q-Tip, there are a few others listeners may be unfamiliar with.

1. Tweet (“Weary”)

It’s been a long time since listeners heard Tweet on the radio with her 2002 hit song, “Oops (Oh My),” but the singer has stayed busy throughout her career. Tweet’s vocals appear on “Weary,” “Mad” and “F.U.B.U.”

2. Moses Sumney (“Mad”)

The Los Angeles-based singer has a knack for working with some of music’s best. He recently released a collaboration with Thundercat and has appeared on stage with Sufjan Stevens.

3. Sampha (“Don’t Touch My Hair”)

One of music’s most underrated artists, the British singer has worked with a who’s who of music including Drake, Kanye West, SBTRKT and Jessie Ware.

4. Dev Hynes (“Interlude: This Moment”)

Best known for his work as Blood Orange, Hynes previously worked with Solange on her 2012 EP, “True.”

5. Kelsey Lu (“Interlude: This Moment”)

Credited as Lu of Carolina, Lu is a classically trained cellist who hails from Charlotte, North Carolina. Lu not only plays the cello but also sings.

6. Sean Nicholas Savage (“Where Do We Go”)

Known for his poetic lyrics, Sean Nicholas Savage hails from Montreal, Canada and is recognized for his work among the Canadian indie music scene.

7. BJ The Chicago Kid (“F.U.B.U.”)

BJ the Chicago Kid has quickly become one of hip-hop’s go-to singers. The singer-songwriter has been featured on songs with Schoolboy Q, Kendrick Lamar and Jay Rock.

8. Nia Andrews (“Interlude: I Got So Much Magic, You Can Have It”)

While most of the interludes on “A Seat at the Table” features people such as Master P and Tina Knowles talking, “I Got So Much Magic” is short clip of Kelly Rowland and Andrews showing off their vocals. 

9. Kelela

The Los Angeles artist is featured on the album’s final song, “Scales.” In 2013, Kelela put out her mixtape, “Cut 4 Me.”