While anime was on the rise in the '90s thanks to Dragon Ball Z and Sailor Moon, the medium exploded in the new millennium with One Piece and Case Closed. With services like Crunchyroll and Funimation, it's easier than ever to view your favorite anime. One of the biggest debates in the anime world involves theme songs. Everyone has their favorite. With countless amazing themes, it's hard to pick a top 10, so we're giving you an extra one. On Oct. 28, anime fans around the world will celebrate the medium on International Animation Day. Here are the top 11 anime theme songs:

11. "Pokémon Theme" - Pokemon
Putting the "Pokemon Theme" on this list can easily anger hardcore anime fans, but there's no doubt that it's one of the most memorable themes ever written. It's hard to not sing along with it whenever someone breaks out the song at an anime convention. This is the anime equivalent to "Bohemian Rhapsody," and there's nothing wrong with that. Sung by Jason Paige, the track saw a boost in streams thanks to the 2016 release of Pokémon Go. That same year, the song peaked at number four on the US Kid Digital Songs chart.

10. "Ai o Torimodose (YOU wa SHOCK)" - Fist of the North Star
Fist of the North Star delivered big time with their hard rock theme "Ai o Torimodose," which is sometimes known as "YOU wa SHOCK". With vocals from Monsieur Yoshisaki and Crystal King vocalist Masayuki Tanaka, the song is gigantic enough to pack the Toyko Dome. Outside of the anime, the song was used as Josh Barnett's entrance theme during his stint on PRIDE Fighting Championships.

9. "Guren no Yumiya" - Attack On Titan
While Attack On Titan has had numerous themes over their three seasons, "Guren no Yumiya" is considered to be the true theme. Recorded by Linked Horizon, this theme song took a life of its own with numerous videos of how the theme works with just about everything. The symphonic metal track has also been covered in various musical styles.

8. "What's up, people?!" - Death Note
For Death Note's second opening, they chose Maximum the Hormone's "What's up, people?!" Many felt the track was a complete 180 from the anime's overall tone. Others, however, felt that it was simply what the show needed. Because of its usage, the song became synonymous with video sharing service Nico Nico Douga. The song is taken from the band's 2007 album Bu-ikikaesu.

7. "ZERO!" - The Devil is a Part-Timer!
Singer Minami Kuribayashi has been involved with various anime series in her career. "ZERO!!", which is the opening theme for The Devil is a Part-Timer!, celebrates the singer's 10 year anniversary. The song fits perfectly with the show's wacky yet action filled premise of demons forced to live amongst humans.

6. "Let Me Hear" - Parasyte
Parasyte's "Let Me Hear," which is from Japanese electronic rock band Fear, and Loathing in Las Vegas, completely revs up the viewer with driving guitars and wrathful growls. Those that listen to the remainder of the song will be treated to a barroom brawl between EDM and metalcore. The song stems from the band's 2015 studio album Feeling of Unity. In Japan, the song peaked at number seven on the Billboard Japan Hot 100 chart.

5. "Cha-La Head-Cha-La" - Dragon Ball Z 
While many Dragon Ball Z fans in North America are familiar with "Rock The Dragon," its Japanese counterpart "Cha-La Head-Cha-La" easily takes the cake. Singer Hironobu Kageyama was a huge Dragon Ball fan during its manga days, and he was simply thrilled to work on the tune. The Latin America and Brazil broadcasts of the show had their own version of the tune.

4. "History Maker" - Yuri On Ice
Acclaimed series Yuri On Ice got the approval of many figure skaters, including two time Olympian Johnny Weir. When it came to the theme song, the producers turned to singer Dean Fujioka. The end result is "History Maker," and it's become a hit for anime fans and figure skaters around the world. The song was played during the 2017 Grand Prix of Figure Skating Final in Nagoya.

3. "Inner Universe" - Ghost in the Shell: Stand Alone Complex
Late singer Origa had a strong connection with the Ghost in the Shell series, and it all started with Stand Alone Complex. "Inner Universe" brought her fame outside of Russia, which led to appearances in video games such as Final Fantasy XIII-2 and Allods Online. With lyrics sung in Russian, Latin, and English, this is easily one of the most unique anime themes ever written.

2. "Tank" - Cowboy Bebop
The entire Cowboy Bebop soundtrack is something that non-anime fans can dig if they hear it for the first time, and opening theme "Tank" is just as chaotic as the show's opening sequence. When it came to the soundtrack, iconic producer Yoko Kanno wanted to steer clear of the rock and J pop heard in anime around that time. The end result was one of the most praised soundtracks for any form of animation. 

1. "A Cruel Angel's Thesis" - Neon Genesis Evangelion
"A Cruel Angel's Thesis" from Neon Genesis Evangelion is about as '90s as you can get. Anime director Hideaki Anno originally wanted to use some classical music for the show's opening theme. Instead, he chose to make it a J-pop tune with vocals from Yoko Takahashi. The track proved to be a major success with three million copies sold worldwide. Over 20 years after its release, it's still one of the most chosen songs at karaoke bars in Japan.