Since TOS was likened to ragnarok… and has the same creator…
Ragnarok was known for it’s amazing original BGM’s…I am just wondering though… Are some of the BGM’s of ragnarok being reused too in this game? or all of its BGM are of it’s own? 
… anyway…either way is fine… i am just so hyped up to play this game… since i failed to a chance of being a beta tester… ill ask it here… 
No BGMs from Ragnarok are in ToS. All of their tracks are made for ToS alone, with the exception of one from their previous game, Granado Espada.
IMC do not own the rights to Ragnarok. Even though they have the same creator, Gravity holds the rights to Ragnarok including its soundtracks.
However, you’ll be happy to know that SoundTeMP, the composers of RO’s music, alongside SFA, Questrosound and Symphonix are behind the soundtrack.
Check it out the current soundtrack here, and see for yourself. 
Nowadays, it’s a dime in a dozen and definitely nothing spectacular, so rest assured that just about anything reasonable will be equal to or greater than Ragnarok’s tracks, objectively.
If you’re after nostalgia… then perhaps it may be more challenging.
Here is the most complete version of all the current TOS bgms that you can find. Enjoy. 
http://www.mediafire.com/download/ii1jhnvw7q57i4h/itos_bgm.7z (420mb)
This is the entire BGM folder from the iCBT, not sure if kCBT3 has any newer ones yet.
Thx for the reply guys… oh, i forgot the copyrights…well it is nice to know that the same composers of RO is the one that will make the soundtrack of TOS… I’m glad to know that… honestly for me, game sound tracks is a big factor for me in loving games and knowing ro has the same composers as tos i believe the TOS sountrack will become meaningful for me just like RO before… so yeah… thx for the link for the BGM…