Since my Lichtwecker has only one not very beautiful endless loop with birdsong, I was looking for a track that's longer than the usual 5-6 minutes. Since the brightness of the alarm increases within 30 minutes, I wanted something similar reached by alarm. I have this track now on my Android and use AlarmDroid because I can specify the duration of the alarm tone, as well as using the "gentle alarm" and an increase in volume over a freely selectable period of time here. Simultaneously with the light now also the great bird songs begin from that track to bring me gently out of sleep. The quality of the tracks I rate as very good, the content is a very relaxing atmosphere is created by the beautiful songbird calls. Price / performance is very good!
On another website I found an indication that this track was recorded in May 2010 at sunrise in Schorfheide Chorin.