Both Ways (Remix)
From Halopedia, the Halo wiki
Both Ways (Remix), or Uphill, Both Ways (Remix), is the seventeenth track (Disc 2 Track 10) included in Halo: Reach Original Soundtrack.
The track is a remix of the piece Uphill, Both Ways from the track The Office of Naval Intelligence in the Halo 3: ODST Original Soundtrack. The track features bass and light piano on top of the original track.
Before the release of Halo: Reach, a shorter version of the track, titled Uphill, Both Ways MP Madness Remix was made available for download from Bungie.net on June 4, 2010. This version features a shorter introduction and runs for 1 minute and 23 seconds.
Both Ways (Remix) is a bonus track found exclusively in the soundtrack, and thus cannot be heard in any part of Halo: Reach.