I guess that when these two soundtrack CDs were out, I still hadn't finished my works of last year before moving on to the works of two years ago which I recently started. For Beatmania IIDX 20 Tricoro OST, it contained the normal songs from the game as well as the songs from the events such as Legend Cross and Omega Attack. Speaking of Omega Attack, it is still on-going and having to go through it completely is a son of a butt because you're supposed to eliminate the viruses off the map including the songs that are parts of the sectors that are affected as well. There are also boss songs which can be really hard as well but it can't be a problem tackling them in Normal difficulty. However, by playing in Normal, I guess that you may get lesser bonuses like that. Also, you're gonna need lots of Dellars or whatever to buy those weapons needed to wipe out more viruses off the map in Omega Attack. It's seriously money and credit consuming but at least it may be how you may enjoy Beatmania IIDX 20 Tricoro.
For Reflec Beat Colette OST, it may be the same sort of thing, containing songs that are in Standard Mode as well as the songs from the events such as the Adventure Mode or whatever it is where you need to guide Pastel through various places. I guess that navigation through this mode is somewhat easier through the touch screen feature.
Anyway, these two soundtrack CDs were recently out last month or something so that you can enjoy the songs from the game without having to view the freaking online videos of the respective songs you want that have the gameplay on them but take note, some of the songs may be different on the CDs and the bonus tracks may be either remixes or perhaps the full versions of the songs.