Simple Java MP3 API Needed

I need to do a few basic modifications to MP3 files (which may or may not contain ID3 tags) in a Java application I'm maintaining. I just need a very simple API I can use, possibly even a wrapper for some other library, that can do the following things: 1. Resample an MP3 file from one bitrate to another 2. Add a given number of "dead air" seconds to the beginning of the file 3. Raise or lower the audio volume of the file by a given number of decibels 4. Do all three of these operations in one method, loading the file from disk and writing it back to disk only once. 5. Do all of the above without damaging ID3 tag information that may be present 6. Retrieve the play length, in seconds, of an MP3 file by analyzing it (as opposed to trusting an ID3 tag or some such) 7. Retrieve the bitrate in Kbps of an MP3 file by analyzing it (as opposed to trusting an ID3 tag or some such) You're welcome to use any 3rd party lib you'd like, as long as it is clear for commercial use without licensing fees or code release restrictions. You can also use any command-line tools (such as LAME) or DLLs. This app only needs to run on Windows, if that helps. I just need a way to do the 7 steps listed above from a Java app and am completely un-picky about how it's done.