# Week 7 Lesson 3 - Composing tracks with the 'ur' function

**URL:** <https://uzu.lurk.org/t/week-7-lesson-3-composing-tracks-with-the-ur-function/1340>\
**Category:** Week 7 - composition\
**Created:** [5 June 2020 19:34 UTC](https://uzu.lurk.org/t/week-7-lesson-3-composing-tracks-with-the-ur-function/1340 "2020-06-05T19:34:10Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![yago](https://uzu.lurk.org/letter_avatar_proxy/v4/letter/y/bc8723/32.png) [@yago](https://uzu.lurk.org/u/yago)\
**Post date:** [7 June 2020 11:23 UTC](https://uzu.lurk.org/t/week-7-lesson-3-composing-tracks-with-the-ur-function/1340/11 "2020-06-07T11:23:19Z")

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Hello @yaxu,

I have a question related to patterning chords but did't know if this lesson is the right place post it (I can change it if not).  
The point is I am trying to use ur to create a melody (here a simplified example):

> let parts =  
> [  
> ("a", n "c'maj" # s "superpiano"),  
> ("b", n "a'maj" # s "superpiano"),  
> ("c", n "f'maj" # s "superpiano")  
> ]  
> in  
> d1 $ ur 3 "a b c" parts

but I'd like that Tidal started playing at the beginning. I tried with "trigger" and "qtrigger" functions but doesn't seem to work. (d1 $ trigger $ ur 3 "a b c" parts ). Is there an alternative?

Additionally, is there a way to play it just once? (if you use once instead of d1 it plays just "a".

Thanks for your help!

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_[View the full topic](https://uzu.lurk.org/t/week-7-lesson-3-composing-tracks-with-the-ur-function/1340)._