The two fandoms of choice here are Heroes and House. Some of these fics are more gen fic than others. But the majority do have some kind of slashiness within.
All of the song links are from imeem, since the site allows for streaming entire tracks. I regret to say that it requires the usual registration with an e-mail address, but at least this way you can stream entire songs without having to pay first through iTunes or something.
Heroes fanfic recommendations
Quietly Suburban Warfare by toestastegood
Characters/Pairing: Claude/Bennet (but honestly, Sandra/Bennet = TruWuv, so I choose to ignore the single line of text that suggests the previously listed pairing :P. Even if this is a slash community I'm posting to.)
Summary: Claude drops in on his former partner for the last time.
"A nice house in the suburbs, mate - it's not exactly deep cover, is it?"
Street Spirit by Radiohead
Note: Jazz musician Eliza Lumley did a very interesting rendition of this song. Here is the link, should it pique your interest: Street Spirit by Eliza Lumley
Disturbed by paxlux
Characters/Pairing: Mohinder, Mohinder/Sylar.
Summary: First-person narrative.
"Who in the their right mind, after seeing the things I’ve seen, the conversations I’ve had about exploding men and regenerating cheerleaders and serial killers with a need for neurological matter, who would stay here in the same city, day after day, hating themselves for staying and hoping and making demands that no one has any right to make? Would they still be sane?"
Glass souls by Benzos
Characters/Pairing: Sylar, Mohinder/Sylar
Summary: Another first-person narrative. Companion to "Disturbed."
"Conversation came easily between us; it was like seeing an old friend after several years only to find it’s as if no time has passed at all. Nothing was forced, nothing was feigned; everything just fell into place."
Stromata by Charolette Martin and Bullet Proof… I Wish I Was by Radiohead
Notes: Again, Ms. Lumley has also covered Bulletproof… I Wish I Was.
On the Boulevard by aurilly
Characters/Pairing: Mohinder, Sylar, subtext of Mohinder/Sylar
Summary: Mohinder and Sylar enter a verbal repartee.
"'If you really despised my company that much, you could very well just get up and go improve your awful wardrobe at that Zara across the street… although Le Bon Marché is only a few blocks away and would be a much better use of your money… and yet you don’t. Therefore, I can only assume that you really do enjoy sitting here with me.'"
Return of the rocking chair by Andrea Parker and All I Need by Radiohead
Also, including this song solely to amuse myself: Flowers by Emilie Simon
While you were sleeping by poetess_noire
Characters/Pairing: Matt, Mohinder/Sylar
Summary: "When he was having trouble sleeping was the only time he broke the unspoken rule. Mohinder wasn’t awake to get aggravated, and there was something soothing rather than guilt-inducing about stepping into the dreams and thoughts of others when they were completely unaware and sound asleep."
Remember Me as a Time of Day by Explosions in the Sky and A Hopeless Attempt by Charlotte Martin
We talk in code by blueinkedwalls
Summary: A very surreal look at Mohinder's dreams. Reminds me quite a bit of James Joyce's Ulysses. Takes place during the season one road trip.
"He digs his knees into the sand and begins connecting the dots, drawing lines between the circles until they’re a map. These paths all lead to the same place."
Clutching at Straws by Andrea Parker
House fanfic recommendations
Nocturne in Grey and Gold by ignites
Summary: A piano, a motorbike, a river, a few telephone calls, fifty cents gone for good, and one late-night conversation about the lies our forefathers told us.
The Less You See by I Love You but I've Chosen Darkness
Kayser-Fleischer Rings by drworm
Summary: The relationship Dr. Wilson has with his wife is represented by a circle. The relationship he has with Dr. House is represented by a Möbius strip.
Sultan by What Made Milwaukee Famous
Tracking Time by Namaste
Characters/Pairing: House, Wilson, House/Stacy (gen fic)
Summary: A look at House and Wilson’s friendship and how it developed, with glimpses at points in their lives over the past eight years or so.
Crosses by Jose Gonzales
White Daisies Passing by Rocky Votolato
According to Plan by I Love You but I've Chosen Darkness
How We Operate by Gomez
Playing for Position by npkedit
Summary: Just how did Chase manage to make it where no other fellow had gone before.
Everybody Knows by Rufus Wainwright