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I solved it like this.

<?php $discography_group = get_post_meta( get_the_ID(), '_cmb2_discography_group', true ); ?>

		<ul>
			<?php foreach ( $discography_group as $value ) { ?>

				<li>
					<h1><?php echo $value['track_title'] ?></h1>
					<p><?php echo $value['track_label'] ?></p>

					<?php $link = $value['buy_link']; ?>
						<?php foreach ( $link as $value_link) { ?>
							<a href="<?php echo $value_link ?>" target="_blank" class="float-right"></a>
						<?php } ?>

				</li>
			<?php } ?>

		</ul>

Any advice to improve the code or this is sufficient?
Thanks

works like a charm.
Thank you so much.
I owe you a beer 😉

Great, works fine.
Thanks for your help.
Really appreciated.