- The Session : probably the biggest trad tune database online.

Great for:

• ABC notation

• Music sheets 

• Recordings

• Session tune discussions

• Tunes sets

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- The Traditional Tune Archive : Massive archive with historical info, tune variants, origins, recordings etc. Not just Irish tunes, North American and British also.

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- ABC notation : Handy for searching tunes quickly and hearing MIDI playback.

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- Tunepal : It has a tune recognition feature which is great when you know how the tune goes but don't know the name, you can literally play a tune and it'll try to identify it. You can also search tunes, compare versions and see ABC notation.

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- TradChords : Specifically made for Irish trad accompaniment (guitar, bouzouki...): Chords for Irish tunes, backing tracks, tabs, tune playback, adjustable tempo, community-submitted arrangements. 

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