Added Speed of Sound

Pro Strings/Rock Band 4 DLC/README.md

@@ -4,6 +4,7 @@
 | :--------: | :-------: | :---------------: | :------------: |
 | Seasons of Wither | Aerosmith | G: E Standard<br>B: E Standard | same as in-game |
 | Them Bones | Alice in Chains | G: E Standard<br>B: E Standard | G: Db Standard<br> B: Db Standard |
+| Speed of Sound | Coldplay | G: E Standard<br>B: E Standard | same as in-game |
 | F.C.P.R.E.M.I.X | The Fall of Troy | G: E Standard<br>B: E Standard | same as in-game |
 | Jane | Jefferson Starship | G: E Standard<br>B: E Standard | same as in-game |
 | Born To Be Wild | Steppenwolf | G: E Standard<br>B: E Standard | same as in-game | 

Pro Strings/Rock Band 4 DLC/speedofsound2/upgrades.dta

@@ -0,0 +1,12 @@
+(speedofsound2
+   (upgrade_version 1)
+   (midi_file "songs_upgrades/speedofsound2_plus.mid")
+   (song_id 1020518)
+   (rank
+      (real_guitar 262)
+      (real_bass 226)
+   )
+   (real_guitar_tuning (0 0 0 0 0 0))
+   (real_bass_tuning (0 0 0 0))
+   ;(strings_author JDK)
+)