My favorites are W-B-X, Just Live More, and Journey Through the Decade. Surprise Drive has become one of my favorites lately as well.

5. Journey Trhough the Decade - Gackt (Kamen Rider Decade)
4. Round ZERO~BLADE BRAVE - Nanase Aikawa (Kamen Rider Blade)
3. Kokoro Tsunagu Ai/Hearts Connect Love - BYUE (Kamen Rider J)
2. Kamen Rider Black - Tetsuo Kurata (Kamen Rider Black)
1. Alive a Life - Rica Matsumoto (Kamen Rider Ryuki)

Anything Goes and W-B-X are both really good themes. Kamen Rider Agito's 1st theme is probably my current favorite though. I dig the guitar riffs.

Current Top 10 (Counting both song and video)

10. Suprise Drive (Kamen Rider Drive)
9. Anything Goes! OOO (Kamen Rider OOO)
8. Kamen Rider Agito
7. Round Zero ~Blade Brave~ (Kamen Rider Blade 1st)
6. Kagayaki (Kamen Rider Hibiki 1st)
5. Life is SHOWTIME (Kamen Rider Wizard)
4. Kamen Rider Kuuga
3. Break the Chain (Kamen Rider Kiva)
2. Journey Through the Decade (Kamen Rider Decade)
1. Elements (Kamen Rider Blade 2nd)

Phew. That list used to be very different last year.

Thread revival! Sorry; I missed out on this one and was just thinking of starting a thread with the same topic.

Kuuga has to be my top theme song. It's all hot blooded and powerful.

W-B-X has a special place in my heart because W is my favorite series, but I have to say that Anything Goes! and Switch On! are awfully catchy. They're probably the two that got stuck in my head the most.

My favorite themes are Anything goes, Mind garden, Cosmic mind, Power to tearer, Journey through the decade, Next decade, Action zero, Surprise drive and whatever mach's theme is called.

1. Journey Through The Decade (GACKT-SAMA!!!)
2. Just Live More
3. Last Engage
4. Missing Piece