With all that the Apple iPhone has to offer in downloadable applications—from credit card terminals to flatulence generators—a string player is left to think, “Is there an app for that?” Check out these 15 appropriate apps under $10.

1. Dolce Music Flash Cards ($4.99; Fast Rabbit Software, LLC)
Timed flash-card quiz to identify key signatures, symbols, and treble and bass clefs. Try beating their best ten-out-of-ten questions in 31 seconds.

2. Tempo (Metronome with Setlist) (99¢; Frozen Ape)
Pulsating LEDs and changeable sound settings, 17 time signatures, and six rhythm patterns. “Setlist” feature saves your settings. Bonus is the digital pitch pipe. Rock steady.

3. New York Philharmonic (Free; InstantEncore.com)
Concert schedules and notes, news, blogs, podcasts, and a few live recordings. Includes link to buy concert tickets. More artists to be added by InstantEncore.com.

4. Music Skills (.99¢; Fabio Ricci)
Tests knowledge of treble and bass clefs by flashing a note that you must find on a mini piano. You’ll be a staff sergeant in no time.

5. Violin Guy–Celtic ($1.99; Playvisions)
Thirteen Irish tunes played by Geoffrey Castle on a six-string violin. Volume increases as phone is bowed back and forth. “Oy! Wake up, ‘Drowsy Maggie!’”

6. Musicopoulos: Music Theory and Practice ($1.99; SpartanApps)
Brief violin lessons with accompanying practices in notes and intervals, scales, and chords. Finally, you can fit your favorite class in your pocket.

7. iStroboSoft ($9.99; Peterson Tuners)
Tuner measures to the 1/10th-cent accuracy. Equipped with noise filter, input boost, and alternate tuning modes. Adaptor cable for electric instrument sold separately. So precise you’ll never trust your ears again.

8. MonaMusic ($2.99; Mona Lisa Sound)
Follow rocking arrangements of “Scarborough Fair” and “O Little Town of Bethlehem” by the Hampton Rock String Quartet with digital sheet music to flip through.

9. FlagPig’s Jigs 1/ FlagPig’s Reels 1 (99¢ each; Wil Macaulay)
This forgetful fiddler’s reference guide to 25 jigs and 25 reels in staff notation, viewable in landscape and portrait modes. May have lost me marbles, but not me phone.

10. Wunder Radio ($6.99; Weather Underground)
More than 30,000 AM/FM radio stations will have you flipping from NWPR Classical Music in Moscow, Idaho, to ABC Classic FM in Melbourne, Australia. G’day? Is now.

11. Real Violin ($1.99; Phyar Studio)
Here’s a chance to test your dexterity. Virtual fingerboard simulates a whole section of violins when pressed and bowed (by swiping the screen with a finger). Wiggle your finger for vibrato and hit fantastical double-, triple-, and even quadruple-stops in Touch mode. Includes cello and viola modes.

12. Metronome-iTick (Free; Music Motion)
No-frills metronome is no looker, but it provides the necessities: time signatures, Italian tempo markings, and beats per minute. Changeable downbeat and upbeat sounds make for fun listening outside the practice room.

13. Cleartune Chromtaic Tuner ($3.99; Bitcount)
Chromatic tuner’s note-wheel display and familiar options evoke gentler times. Features include changeable temperament, notation, calibration, damping, and pitch pipe/tone.

14. Pandora (Free; Pandora Media, Inc.)
Hankering for Bach’s Concerto for Oboe or Violin? This handy Internet radio station plays what you actually like, creating play lists based on the anatomy of a song, genre, or artist of your choosing. And at no charge. Includes a station programmed for “violin features.” It knows what you’re thinking.

15. Voice Memos (Free; comes with the iPhone OS 3.0 software update)
Cheap way to record audio, especially practice sessions, which can be downloaded to your iTunes library. Noodle a cadenza to a Mozart concerto? Save it before it becomes “Desperado” again.