Is an easy-to-use audio editor. It works accross platforms. You can trim, paste, undo, and copy.
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Audio Editing

Audacity -   ->open source audio recording and editing program

Acoustica -   ->audio editor built for recording

TwistedWave -   ->audio editor

MP3 Cutter -   ->audio cutter

AudioTool -   ->is a beat making app


Songsmith (

by MICROSOFT, it generates musical accompaniment to match a singer's voice. just choose a musical style, sing into your PC's microphone, and Songsmith will create backing music for you.

Musipedia (

is a searchable, editable, and expansible collection of tunes, melodies, and musical themes. Every entry can be editable by anybody. Use it to search for and identify tunes, by melody (pitch and rhythm), melodic contour or just rhythm.
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Musopen (

is an online library of music recordings and sheet music. its mission is to set music free. tho this end it offers access to a range of musical resources for free, without copy right restrictions. Search by composer, performer, instrument and time period.

Raindrop Melody Maker (

Create music from raindrops.

Audiotool (

Make and publish your own music online with this nifty bit of software.