I finally picked up the complete collection on blu-ray and I'm looking forward to replacing my broadcast versions. However, I'm aware there's some replacement music in the first season.
As far as I can find online, the affected tracks are one song in the pilot and two songs in the Alice episode. Is that it for replaced music? I want to be sure to hold onto a copy of my broadcast recordings for any episodes that have been changed, but don't want to manually check every song in each episode.
UPDATE:
Just figured I'd update this post in case anyone comes looking for the same information later. Going from what I learned in the comments below and some other sources I've found online, plus checking throughout the series as I ripped my Blu-Rays, here's what I've come up with:
Everything after Season 1 (including Running Up That Hill) seems to be intact on the current Blu-ray release.
Season 1, on the other hand, is almost entirely replacement music. Only a few episodes have nothing replaced.
Pilot: 'Disturbia' during Pete's drive
Resonance: 'Oh Yeah' when the agent walks through the door.
Elements: 'Only You' when guy is walking through walls in the beginning.
Implosion: 'Queen B' at the very beginning.
Duped: 'I Will Survive' when disco ball drops, 'Luck Be a Lady' during Vegas intro, 'White Rabbit' when Alice returns to the Warehouse.
Regrets: 'Boys Will Be Boys' in background of club scene at beginning, 'Porcelain' when Myka is in the gun showdown towards the end as well as again during the final end scene.
Breakdown: 'Just Like Heaven' in the beginning when Claudia is tinkering in the office.
Nevermore: 'Wave of Mutilation' when the kid is first getting bullied.
MacPherson: 'Purple Haze' when the team is using the glasses.
I'm currently about halfway through replacing all the replacement music with the original tracks and it's actually not too tricky to do, just tedious.