The end of the year is here and Billboard has given their opinion by ranking the '20 Best K-Pop Songs of 2015'. There's an eclectic mix of top idol groups, solo singers, collaborations and hip-hop artists. Clearly effort was put in to include both chart-topping and underrated songs of 2015.

1. Big Bang's "Loser"

2. Girls' Generation Taeyeon's "I"

3. BTS' "Run"

4. Zion.T and Crush's "Just"

5. Keith Ape's "It G Ma"

6. 4minute's "Crazy"

7. G.Soul's "You"

8. Kim Ye Rim (Lim Kim)'s "Awoo"

9. EXO's "Call Me Baby"

10. miss A's "Only You"

11. Primary ft. AOA's ChoA and Iron's "Don't Be Shy"

12. 15&'s Park Ji Min's "Hopeless Love"

13. Block B Zico ft. Zion.T's "Eureka"

14. Oh My Girl's "Closer"

15. Big Bang's "Bae Bae"

16. GOT7's "If You Do"

17. KARA's Gyuri and From the Airport's "The Little Prince"

18. SHINee's "View"

19. Naul's "Living in the Same Time"

20. B1A4's "Sweet Girl"

And in case you missed it, Billboard also ranked the '10 Best K-Pop Albums of 2015' as well.

1. Wonder Girls' 'Reboot'

2. f(x)'s '4 Walls'

3. Brown Eyed Girls' 'Basic'

4. BTS' 'The Most Beautiful Moment in Life Pt.2'

5. MFBTY's 'Wondaland'

6. IU's 'Chat-Shire'

7. Red Velvet's 'The Red'

8. 2PM's 'No.5'

9. Seventeen's '17 Carat'

10. TVXQ's 'Rise As God'

SEE ALSO: LE SSERAFIM's Sakura unable to attend schedules today due to poor health

Do you agree with these lists? What are some of the best songs and albums of the year in your opinion?