Create, play and print beautiful sheet music.

FreePiano is a virtual MIDI keyboard and a VST host for MS Windows. You can use FreePiano to play piano with a computer keyboard or a MIDI keyboard with any VST instrument you like, or output through MIDI, or generate any MIDI message with any key on your keyboard. You can also record your song or export a MP4 movie to share with your friends.

Denemo is a free music notation program for GNU/Linux, Mac OSX and Windows that lets you rapidly enter notation which it typesets using the LilyPond music engraver. Music can be typed in at the PC-Keyboard, played in via MIDI controller, or input acoustically into a microphone plugged into your computer’s soundcard.
You can use the YouTube Audio Library to get free music and sound effects to use in your videos.
www.youtube.com/c/audiolibrary-channel
www.audiolibrary.com.co
Written in Python, Mopidy plays music from a local disk, Spotify, SoundCloud, Google Play Music, and more. You edit the playlist from any phone, tablet, or computer using a range of MPD and web clients.

Rosegarden is a music composition and editing environment based around a MIDI sequencer that features a rich understanding of music notation and includes basic support for digital audio. It’s an easy-to-learn, attractive Linux application that is ideal for composers, musicians, music students and small studios or home recording environments.

Frinika is a free, complete music workstation software for Linux, Windows, Mac OSX and other operating systems running Java. It features a sequencer, soft-synths, real-time effects and audio recording.

The LinuxSampler project was founded in 2002 with the goal to produce a free, (cross-platform), streaming capable, open source, pure software audio sampler with high stability, efficiency and very low latency, while providing professional grade features, comparable to both hardware and commercial Windows / Mac software samplers and to introduce new features not yet available by any other sampler in the world.

Visual Front Ends ~ GUI:

QSampler

JSampler
Impro-Visor (short for “Improvisation Advisor”) is a music notation program designed to help jazz musicians compose and hear solos similar to ones that might be improvised. The objective is to improve understanding of solo construction and tune chord changes. There are other, secondary, things it can do, such as improvise on its own. It has also been used for transcription. Because rhythm-section (e.g. piano, bass, drums) accompaniment is automatically generated from chords, Impro-Visor can be used as a play-along device. Now having a wider array of accompaniment styles, its use is not limited to jazz.

www.cs.hmc.edu
sourceforge.net/projects/impro-visor
en.wikipedia.org/wiki/Impro-Visor
OpenSebJ is a free real time audio sample mixer that runs on Microsoft Windows. The source code for OpenSebJ is released under the GNU General Public License.
- Supports loading of 255 audio samples, in wav format, which can be played in real time.
- Sample properties such as volume, pan and frequency can be adjusted individually for each sample. (even during mid-play)
- A composition tool is provided and presented in a familiar multi-track sequencer environment. Looping compositions are also supported.
- Samples can be linked to keys on a keyboard and triggered in real time when a key press occurs.
- Each sample can also have the play cursor position adjusted while the sample is playing, to provide a virtual needle to be moved.
- Stream to disk recording, allows all audio played from OpenSebJ to be saved.
- Pitch shifter roll, allows an order to be set up, so that each time a sample is played, the next pitch shift in the sequence is undertaken before the sample is played. i.e. set up a sample to key ‘1’, then set up a pitch shift sequence, high, mid, low, higher, etc. (using frequency values which are transposed onto screen ‘ranges’ to allow easier utilization).

NINJAM is open source (GPL) software which allows people to make real music together via the Internet. Every participant can hear every other participant. Each user can also tweak their personal mix to their liking. NINJAM is cross-platform, with clients available for Mac OSX, Linux and Windows. REAPER (our digital audio workstation software for Windows and Mac) also includes NINJAM support (ReaNINJAM plug-in).

www.cockos.com/ninjam
autosong.ninjam.com/server-list
github.com/justinfrankel/ninjam
en.wikipedia.org/wiki/Ninjam
MilkyTracker is an open source, multi-platform music application for creating .MOD and .XM module files. It attempts to recreate the module replay and user experience of the popular DOS program Fasttracker II, with special playback modes available for improved Amiga ProTracker 2/3 compatibility.
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milkytracker.titandemo.orgsite
github.com/milkytracker/MilkyTracker
en.wikipedia.org/wiki/MilkyTracker