iReal Pro

Practice makes perfect. iReal Pro offers an easy-to-use tool to help musicians of all levels master their art. It simulates a real-sounding band that can accompany you as you practice. The app also lets you create and collect chord charts of your favorite songs for reference.
~One of Time Magazine's 50 Best Inventions of 2010~
Used by thousands of music students, teachers and some of the world’s top music schools such as Berklee College of Music and Musicians Institute.
“It’s the perfect technology for a practicing musician: high-quality digital audio, mixable, transposable into any key and completely mobile. Now every aspiring musician has a backup band in their pocket.” – Tim Westergren, Pandora Founder
• It's a Book:
Create, edit, print, share and collect chord charts of your favorite songs for reference while practicing or performing.
• It's a Band:
Practice with a realistic sounding piano (or guitar), bass and drum accompaniments for any downloaded or user-created chord chart.
FEATURES:
Have a virtual band accompany you as you practice
• Choose from the included 51 different accompaniment styles (Swing, Ballad, Gypsy Jazz, Bluegrass, Country, Rock, Funk, Reggae, Bossa Nova, Latin,...) and even more styles are available as in-app purchases
• Personalize each style with a variety of sounds including piano, Fender Rhodes, acoustic and electric guitars, acoustic and electric basses, drums, vibraphone, organ, and more
• Record yourself playing or singing along with the accompaniment
Play, edit, and download any songs you want
• 1000s of songs can be downloaded from the forums in a few simple steps
• Edit existing songs or create your own with the Editor
• The Player will play any song that you edit or create
• Create multiple editable playlists
Improve your skills with the included chord diagrams
• Display guitar, ukulele tabs and piano fingerings for any of your chord charts
• Look up piano, guitar and ukulele fingerings for any chord
• Display scale recommendations for each chord of a song to help with improvisations
Practice in the way, and at the level, that you choose
• Includes 50 exercises for practicing common chord progressions
• Transpose any chart to any key or to number notation
• Loop a selection of measures of a chart for focused practicing
• Advanced practice settings (automatic tempo increase, automatic key transposition)
• Global Eb, Bb, F and G transposition for horn players
Share, print, and export – so your music follows you wherever you need it!
• Share individual charts or whole playlists with other iReal Pro users via email and the forums
• Export charts as PDF and MusicXML
• Export audio as WAV, AAC and MIDI 
• Support for AirTurn™ and other bluetooth page turners
• Upload your songs and playlists to iCloud for safekeeping and for synchronization across any of your iCloud enabled devices such as iPhone, iPad or Mac
Always backup your songs!