I was in a band back in high school and I use to edit my music all day long. My only preference at that time was Fruity Loops and Acid Pro.

For those of you who have moved to Ubuntu Linux and are looking for some fancy cool audio application to edit your music, then this is your lucky day. You get to choose from some of the finest and free audio applications for Linux.

1. Ardour

Ardour is one of the most recommended  digital audio workstations for Linux. It gives you the power to record, edit and mix multiple audio tracks. You can even produce your own CDs using this application.

It's capable of doing multichannel recording, non-destructive editing with unlimited undo/redo, full automation support, a powerful mixer, unlimited tracks/busses/plugins, timecode synchronization, and hardware control from surfaces.

2. Grip

Grip is a fully featured CD player with small screen footprints in "condensed" mode. It has the ripping capabilities of cdparanoia builtin, but can also use external rippers. It also provides an automated frontend for MP3 and other audio format encoders which allows you to take a disc and transform it easily straight into MP3s.

Key Features include

• Full-featured CD player with a small screen footprint in "condensed" mode
• Database lookup/submission to share track information over the net
• HTTP proxy support for those behind firewalls
• Loop, shuffle, and playlist modes
• Ripping of single, multiple, or partial tracks
• Encoding of ripped .wav files into MP3 files (as well support for OGG and FLAC)
• Simultaneous rip and encode
• Support for multiple encode processes on SMP machines
• Adding ID3v1/v2 tags to MP3 files
• Cooperating with DigitalDJ, my SQL-based MP3 jukebox

3. Muse

MusE is a MIDI/Audio sequencer for Linux that offers recording and editing capabilities and aims to be a complete multitrack virtual studio for Linux. It offers the following features

• Record
• Import and Playback
• Midi sequencing
• Audio sequencing
• Use the jack for midi/audio routing.
• Internal Audio Routing Interface
• Perform audio effects like chorus/flanger in realtime!
• AudioGroups
• Input filter
• Record/Playback several mono/stereo inputs and outputs

In addition to all that it offers Drag and drop import of midi, wave and part files.

4. Audacity

Audacity is a free, open source and easy to use audio editor and recorder that not only support Linux but also Windows, Mac OS X, GNU and more.

It offers tons of features like

• Recording
• Import and Export
• Editing
• Effects
• Sound Quality
• Plugins
• Analysis and
• Free and Cross Platform

Other than that you can also  record live audio, convert tapes and records into digital recordings or CDs, edit Ogg Vorbis, MP3, WAV or AIFF sound files, cut, copy, splice or mix sounds together, change the speed or pitch of a recording and more!

5. Hydrogen

Hydrogen is one my favorite audio applications for adding drums to songs. It's an advanced drum machine for Linux which bring professional yet simple and intuitive pattern-based drum programming.

It's very user friendly, easy to use, fast, modular and intuitive graphical interface audio application that offers

• Sample-based stereo audio engine, with import of sound samples in .wav, .au and .aiff formats.
• Support of samples in compressed FLAC file.
• Pattern-based sequencer, with unlimited number of patterns and ability to chain patterns into a song.
• 32 instrument tracks with volume, mute, solo, pan capabilities.
• Multi layer support for instruments (up to 16 samples for each instrument).
• Ability to import/export song files.
• Unique human velocity, human time, pitch and swing functions.
• Multiple patterns playing at once
• Import/export of drumkits.
• Export song to wav or midi file.

If you are a Linux fan and have any more audio applicatons to share, feel free to post it in the comments.