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Not high speed stream, AAC radio stream at 48K or so. I would think this puts less load on the phone than a voice call.
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The audio is a continuous stream of information that must be processed, no 'taking a nap' while its running.
Digital cell 'phones use a "burst" transmission protocol.
(You probably will not find any analog cell 'phones still in use. Those where the ones too big to lose.)
Although the transmitter only outputs 4 watts (max), it usually uses around 12 watts to generate that output.
But the "burst" is very short and uses a very low repetition rate (high 'off' percentage).
So on an average, very low power consumption.
True, there is audio processing going on to match the burst rate of a person's speech to the burst rate of the radio channel.
But this is almost always done in very low power hardware these days.
Plus, on the processing timescale used, there is plenty of opportunity to 'take a break' (or 'go idle').
(Some people you know of may not seem to take a breath while talking, but they do
)
Not so with streaming music.
Even though it is uni-directional (I assume), not bi-directional - there is still no 'going to sleep' while processing it.