S

Mr. Brightside by The Killers

N-E-G-U-S

Don't know about the first, but it could mean just a couple of "G's".

The latter is the signature for the key of C-Major, but more likely it refers to that key's relative minor, A-Minor, which is notated the same way.

Or these?

…and it will happen.

"mystery"

20 Minutes Till Dawn

Android Studio is a fork of IntelliJ IDEA, which is open sourced and free software (under Apache 2.0), with additions from Google (proprietary and closed source, as far as I can tell), so it has components that are both. This is compatible with the Apache license, which doesn't require that derivative works be distributed under the same license.

So, ultimately, Android Studio has some components that are open source and some that aren't.

Without, for anyone interested.