Its basically an experiment by Google called Chrome Music Lab for music lovers and others to learn music. It contains many interesting games / musical fun in it.
The same can be played in mobile also.
How to open it ?
First of all open Google chrome search for chrome experiments or open the the below link
Step 1: RHYTHM
Rhythms are patterns of sound in time. The most common rhythms repeat every four beats, but it can also be every three, five, six, or more. Click on the grid to build your own rhythms.
Step 2: CHORDS
A basic chord is made up of three notes. Tap a note on the piano to play a chord starting on that note.
Step 3: SPECTROGRAM
A spectrogram is a picture of sound. A spectrogram shows the frequencies that make up the sound, from low to high, and how they change over time, from left to right. With this experiment you can compare spectrograms of different sounds, or use the mic to see what your own sounds look like.
Step 4: SOUND WAVES
Sounds travel through the air like waves through water – but a lot faster. The blue dots represent air molecules bouncing back and forth as sound travels through them. Tap the magnifying glass to zoom in and see a red line graphing the position of one molecule, tracing the shape of the wave.
Step 5: VOICE SPINNER
Spin the spinner like a record player - slow, fast, forward, backward - to hear how it affects the sound. You can also record your own voice, or other sounds around you. The pitch of your voice gets higher when spun faster, and lower when spun slower.
Step 6: ARPEGGIOS
An arpeggio is a chord played one note at a time. This experiment lets you play arpeggios in different patterns. Tap the wheel to explore major and minor chords.
Step 7: KANDINSKY
This experiment is inspired by Wassily Kandinsky, an artist who compared painting to making music. It turns anything you draw – lines, circles, triangles, or scribbles – into sound.
Step 8: PIANO ROLL
Originally, a piano roll was a roll of paper that you fed into a self-playing piano to make it play a piece. This experiment is inspired by piano rolls. You can watch the notes flow by, scrub it back and forth, and change the sounds.
Step 9: OSCILLATORS
An oscillator makes sound by vibrating at a steady rate, known as its frequency. Drag your finger up and down to change the oscillator’s frequency, or swipe to hear different types of oscillators. To hear a really slow oscillator, pick the square shape and touch the very bottom of your screen.
Step 10: STRINGS
This experiment lets you explore the natural mathematical relationship between a string’s length and its pitch. For example, the second string is half the length of the first, and it plays the same note an octave higher.
Step 11: HARMONICS
The harmonic series is a set of frequencies with a simple relationship: twice as fast, three times as fast, four times, and so on. Musical intervals emerge from this natural phenomenon, such as the octave and the major chord (like the opening notes of "Star Spangled Banner").
Step 12: MELODY MAKER
Grids like this one are a common interface for creating melodies. Time moves left to right and pitch goes up to down. Tap to add notes, then use the buttons on the bottom to play and change your melody.