This is the list made by Rocky Studio itself to show what songs do you unlock when level up.
You can unlock ALL SONGS just leveling up. you can do freestyle combo achievement to unlock higher level songs before, but every song can be unlocked just playing.
This is the song list and what level do you need to unlock that song.
LV.2 Only for you
LV.3 Memory of Beach
LV.4 Miles
LV.5 U.A.D
LV.6 SIN
LV.7 Hello Pinky
LV.8 Waiting for you
LV.9 End of the Moonlight
LV.10 Your Own Miracle
LV.11 quixotic
LV.12 Light House
LV.13 Good Bye
LV.14 The Obliterator
LV.15 Out Law
LV.16 Cherokee
LV.17 Beyond Yourself
LV.18 Astro Fight
LV.19 Another DAY
LV.20 Ray of Illuminati
LV.21 Memoirs
LV.22 Running girl
LV.23 Jupiter Driving
LV.24 Syriana
LV.25 glory day
LV.26 RED
LV.27 NB RANGER
LV.28 NB Rangers -Returns-
LV.29 NB POWER
LV.30 NB RANGER – Virgin Force
LV.31 ON
LV.32 plastic method
LV.33 Binary World
LV.34 Can We Talk
LV.35 WhiteBlue
LV.36 Child of Night
LV.37 피아노 협주곡 1번 (Piano Concerto No.1)
LV.38 Negative Nature
LV.39 Armored Phantom
LV.40 Enemy Storm
LV.41 Fentanest
LV.42 The Feelings
LV.43 Rock Or Die
LV.44 Road Of Death
LV.45 Rolling On the Duck
LV.46 Remains of Doom
LV.47 Chrono Breakers
LV.48 Midnight Blood
LV.49 WHY
LV.50 BlackCat
LV.51 바람에게 부탁해 ~Live Mix~ (Ask to Wind ~Live Mix~) | FREESTYLE COMBO: 150.000
LV.52 Phantom Of Sky
LV.53 비상 ~Stay With Me~
LV.54 Catch Me
LV.55 Chain of Gravity
LV.56 Kung Brother
LV.57 FTR
LV.58 Mess it Up
LV.59 waiting for me
LV.60 Blythe
LV.61 Yo Creo Que Si
LV.62 Runaway
LV.63 Ya! Party!
LV.64 Showtime
LV.65 Don’t Die
LV.66 Para-Q
LV.67 DIVINE SERVICE
LV.68 Royal Clown
LV.69 Dreadnought
LV.70 Minus 3
LV.71 KILLER BEE
LV.72 MASAI
LV.73 Rocka-a-doodle-doo
LV.74 OPEN FIRE
LV.75 CnP
LV.76 SQUEEZE
LV.77 Secret Dejavu
LV.78 Minimal Life
LV.79 Sunset Rider
LV.80 HAMSIN
LV.81 Dream of You
LV.82 Lemonade
LV.83 태권부리 (Taekwonburi)
LV.84 Triple Zoe
LV.85 Mulch
LV.86 Sunny Side ~Deepn’ Soul Mix~ | FREESTYLE COMBO: 200.000
LV.87 JBG
LV.88 Brain Storm
LV.89 Seeker | FREESTYLE COMBO: 250.000
LV.90 Enter The Universe
LV.91 KUDA
LV.92 A.I | FREESTYLE COMBO: 300.000
LV.93 Smoky Quartz
LV.94 OBLIVION ~Rockin’ Night Style~ | FREESTYLE COMBO: 400.000
LV.95 v o l d e n u i t
LV.96 SIN ~The Last Scene~
LV.97 STALKER
LV.98 We’re All Gonna Die | FREESTYLE COMBO: 500.000
LV.99 Nightmare
Written by El Zerelito