Mass MP3 audio file editor
Running Windows 7 64bit, I have a ton of MP3 audio files I would like to crop the same amount of seconds from the beginning of the audio, is there a Free application that can accomplish this? If no free applications please recommend others.
EDIT: I need something with a gui, no command line software if possible.
Audacity will allow you to perform batch actions (called "chains") on any number of audio files. You'd load in the files, create a chain that trims the necessary number of seconds, and apply the chain to all the files you wish to affect.
dBpoweramp Music Converter (dMC) has a nice GUI and can batch process audio files and has a DSP Effects plugin which includes the ability to trim a fixed amount of time from the beginning or end of a set of files in any of its supported formats. Unlike SoX and Audacity (the other answers), it looks like mp3 is one of the supported formats.
I'm sure SoX can handle this although I'd recommend some reading. It sounds like you're after the "trim" feature.