[iPhone God App] It was found using the iReal ProMusic Book & Play Along actually

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~

“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 35 different accompaniment styles. (More available with In-App purchase)
• 15 Jazz Styles: Afro 12/8, Ballad Even, Ballad Swing, Bossa Nova, Double Time Swing, Even 8ths, Gypsy Jazz, Latin, Latin/Swing, Long Notes, Medium Swing, Medium Up Swing, Slow Swing, Swing Two/Four, Up Tempo Swing
• 8 Latin Styles: Argentina-Tango, Brazil-Bossa Acoustic, Brazil-Bossa Electric, Brazil-Samba, Cuba-Bolero, Cuba-Cha Cha Cha, Cuba-Son Montuno 2-3, Cuba-Son Montuno 3-2
• 12 Pop Styles: 12/8 Rock, Bluegrass, Country, Disco, Funk, Reggae, RnB, Rock, Shuffle, Slow Rock, Smooth, Soul
• 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

Play, edit, and import any songs you want
• 1000s of songs can be imported 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 tabs and piano fingerings for any of your chord charts
• Look up piano and guitar 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 AudioBus and guitar connection kits
• Support for AirTurn™ and other bluetooth page turners

ADDITIONAL FEATURES VIA IN-APP PURCHASE
12 Extra Jazz Styles:
– Ballad Double Time Feel
– Ballad Melodic
– Blue Note
– Doo Doo Cats
– Even 16ths
– Even 8ths Open
– Guitar Trio
– Medium Up Swing 2
– New Orleans Swing
– Second Line
– Trad Jazz
– Up Tempo Swing 2

Always backup your songs!