Did you say “Audio Metrics”?

Did you say “Audio Metrics”?
This is the spectrum of the original music excerpt:
frequency
Excerpt from:
“The Chariots of Fire”
by Vangelis.
Duration: 21s
All spectrograms have been
made using Audacity.
•FFT size: 4096
•Frequency range: DC - 16kHz
(linear scale)
time
frequency
Time-stretched by 200% using algorithm 1:
Algorithm 1:
Time-Domain WSOLA
(Window Similarity
Overlap-Add)
Note: the time axis of
time-stretched versions
has been scaled by 0.5
time
Time-stretched by 200% using algorithm 2:
frequency
Algorithm 2:
The hybrid phase vocoder
presented at AES 125th,
paper #7637
(multi-resolution
implementation of step 2
using 128 FIR filters)
http://www.pitchtech.ch
/Confs/AES125
time
Which algorithm do you think produces the highest quality?
Listen to the actual music excerpts!