My top 5 is:
1. Isolation by NightHawk22 (used in Limbo)
2. HeartBeat by SnoodDood (Used in Heartbeat)
3. Killbot by some random artist idk (used in Killbot)
4. At The Speed Of Light by Dimrain47 (Used in WAYY to many extremes)
5. Sonorous by DerpCat (Used in Trueffet)