The original TV broadcast used synthetic samples, while the soundtrack release features a re-recorded version with a full orchestra . If you'd like, I can: Find sheet music or piano tutorials for this track
Music editors found the track so effective that they repurposed it for the climax of the regeneration itself.
The track is titled "Hologram" because it was originally composed for the scene earlier in the episode where the Doctor's " Emergency Program One " hologram tells Rose to "have a fantastic life".