Before I installed 1.4, in-game music always played frequently, including loading screens, and also it resets immediately when you go to skills tab. Now after installing 1.4, music very rarely plays... most of the time its just dead silent, I only hear ambience. Sometimes I can go 5 minutes before any music plays at all. I think the music adds to the mood of the game and its a shame if they changed it. Or perhaps it may be a bug. Eitherway, is there anything I can do about it? 1.1 worked perfectly for me, but 1.4 has better perfomance. I'l definitely go to 1.1 if I can't find a solution to this issue.

I'm not experiencing this problem with 1.4.21, and nobody mentioned a similar issue during the beta. I would take a look at mods and ini files as the culprit. When Skyrim updates to a new version, it sometimes requires that your ini files be rebuilt, so you may want to try deleting/renaming them to see if this solves the problem. Also, disable and/or remove any mods that you are using to see if they are responsible.

There is a known issue with battle/combat music not playing after a certain point. This may be related to armor rating or character level and the game doesn't register an enemy as a threat, so the combat music doesn't play. This may be different from the issue you're describing, but it is a well-documented issue.

Thank you for the responce. I have no mods installed, playing it clean. The battle music issue I did indeed notice, but thats not what bothers me. I'm really refering to in-game soundtracks of different zones and areas for the atmosphere. For example in Riverwood and Whiterun I could go 5 to 10 minutes without any music starting.

Edit: I have tried deleting .ini files, no luck though. Usually when you tab and go into skills, music stops playing but also immediately resets when you tab back. However, this doesn't happen either, it just makes it stop completely for a long time untill randomly something plays again.
I have to say this is completely taking the enjoyment of the game for me having to play barren dead like that.

I noticed this after the latest beta also; you're not alone. Went from Whiterun through Riverwood, all the way around past Half Moon Mill and back to Whiterun (a good 10 minute jog) with not a single piece of music playing. Music started right up again entering Whiterun. It does seem to be broken, but otherwise, I've had flawless gameplay with this latest beta.