Having just finished celebrating our #2015Breakout Week at Fuse.tv, we're presenting an easy guide for you to revisit the fun as we continue looking back on the year in music. Learn about, marvel and have fun with at the Reflection girl group Fifth Harmony, "Trap Queen" king Fetty Wap, a cappella heroes Pentatonix, Ohio duo Twenty One Pilots and genre-bending popstress Halsey below.

#2015BREAKOUT TUNES

Fifth Harmony's Girl-Group Inspirations: 8 Key Influences, From Destiny’s Child to Girls' Generation

The Essential Halsey Playlist: Seven Songs to Get You Sucked Into Her World

Pentatonix's 10 Most Impressive Covers: "Where Are Ü Now," "Gangnam Style" and More

#2015BREAKOUT FUN

Fetty Wap By the Numbers Breakdown: How Much Does He Say "Yeahhh, Baby"?

All Twenty One Pilots' Albums, Ranked

Plus, ultimate fan quizzes for Fifth Harmony, Pentatonix, Halsey and Twenty One Pilots.

#2015BREAKOUT THOUGHTS

Jeff Benjamin on Why 2015 was Fifth Harmony's Year

Fetty Wap on His Unbelievable Breakout Year, In His Own Words

Maria Sherman on Halsey's Rise to Fame: 10 Times She Ruled 2015

Jeff Benjamin on Why Pentatonix Was the A Cappella Group to Break Through

Zach Dionne on the Ways Fetty Wap Became Much More Than "Trap Queen" in 2015

Maria Sherman on How Twenty One Pilots Created Their Own Pop Empire

Keep up with all Fuse's Best of 2015 coverage right here.